For a direct biological-age estimate, Aeternum and TruAge are the clearest matches in this group: both use DNA methylation, with Aeternum offering a simpler saliva-based route and TruAge reporting several age-related measures from a fingertip blood spot. I rank TruAge Complete Collection first for breadth of methylation-based metrics, while SelfDecode Healthy Aging and Longevity is my pick for people who prefer a cheek swab and genetic insights over a direct methylation test.
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The main tradeoff is not simply which kit promises the most information. It is what kind of information the test measures, how much sample collection you are comfortable with, and whether you want a focused age estimate or a wide collection of genetic wellness reports. PlexusDx offers extensive longevity-related coverage, but the supplied details do not state its result timeline; Aeternum and TruAge specify methylation testing, while SelfDecode and PlexusDx are genetic-variant tests. None of these kits should be treated as a medical diagnosis or a substitute for care from a health professional.
Key Takeaways
- TruAge Complete Collection is my pick for the widest methylation-based age picture, with epigenetic age, telomere length, Dunedin PACE, and additional trait-related reports.
- Aeternum is the most straightforward saliva-based choice here for buyers who want a DNA methylation estimate without a fingertip blood spot.
- SelfDecode uses a cheek swab and focuses on longevity-linked genetic variants, so its recommendations answer a different question from a methylation-based age test.
- PlexusDx lists more than 150 reports, but its supplied product details do not specify how long results take or describe the exact biological-age calculation.
- These tests vary in collection method and interpretation; I would choose based on the measurement and report scope rather than assuming every biological-age result means the same thing.
| TruAge Complete Collection |  | Best Overall for Methylation-Based Age Metrics | Sample type: Fingertip blood spot | Analysis: DNA methylation-based age metrics | Age reports: Epigenetic age and Dunedin PACE | VIEW LATEST PRICE | See Our Full Breakdown |
| Aeternum DNA Biological Age Test Kit |  | Best for a Straightforward Saliva-Based Test | Test type: At-home DNA methylation test | Sample: Saliva | Analysis: DNA methylation markers | VIEW LATEST PRICE | See Our Full Breakdown |
| SelfDecode Healthy Aging and Longevity At-Home DNA Test |  | Best for Genetic Longevity Insights and Gentle Collection | Sample collection: At-home cheek swab | Sample processing: CLIA-certified lab | Analysis: Genetic variants associated with longevity and healthy aging | VIEW LATEST PRICE | See Our Full Breakdown |
| PlexusDx Methylation and Longevity Genetic Test |  | Best for Broad Longevity-Related Genetic Reports | Test type: At-home DNA genetic test | Reports: More than 150 DNA reports | Variants analyzed: Over 200 million | VIEW LATEST PRICE | See Our Full Breakdown |
| biological age test | Analysis | Turnaround | Test type |
|---|---|---|---|
| TruAge Complete Collection | DNA methylation-based age metrics | 2–3 weeks | — |
| Aeternum DNA Biological Age Te | DNA methylation markers | A few weeks | At-home DNA methylation test |
| SelfDecode Healthy Aging and L | Genetic variants associated with longevity and healthy aging | — | — |
| PlexusDx Methylation and Longe | — | — | At-home DNA genetic test |
More Details on Our Top Picks
TruAge Complete Collection
TruAge Complete Collection takes the top spot because it is the broadest match for someone who wants more than a single biological-age figure. Its at-home fingertip blood spot sample is used to report epigenetic age, telomere length, and the Dunedin PACE rate, with additional measures covering immune cell ratios and weight-loss response. That spread lets a buyer examine different angles on aging rather than relying on one headline number.
Compared with Aeternum, TruAge offers a wider set of listed metrics, but its blood-spot collection is a less approachable step for people who would rather provide saliva. Aeternum’s simpler sample method may suit a first-time test-taker who wants a direct methylation test without a finger prick. TruAge’s reported two-to-three-week turnaround is specific, though still not immediate; it is similar to Aeternum’s “few weeks” estimate and slower than an on-demand home reading.
The extra report breadth is a strength only if you want to interpret several related indicators. A large set of results can be harder to act on than a single focused report, and the supplied details do not establish that every metric has the same meaning or usefulness for every person. HIPAA-compliant handling and no third-party sharing are listed, but the kit still requires mailing a biological sample and waiting for laboratory processing. I would choose it for the clearest combination of methylation-based age measures and extra context, not as a replacement for clinical testing.
Pros:- Reports several age-related measures, including epigenetic age and Dunedin PACE.
- Adds telomere length, immune cell ratios, and weight-loss response reports.
- Fingertip blood spot collection can be completed at home.
- Lists a two-to-three-week turnaround and HIPAA-compliant data handling.
Cons:- Requires collecting and mailing a blood spot.
- Results take two to three weeks rather than arriving immediately.
- The number of reported metrics may take effort to interpret.
Best for: People who want several methylation-related aging measures in one at-home kit and are comfortable collecting a fingertip blood spot.
Not ideal for: Anyone who avoids finger-prick sampling, wants results right away, or prefers a short report with one simple takeaway.
- Sample type:Fingertip blood spot
- Analysis:DNA methylation-based age metrics
- Age reports:Epigenetic age and Dunedin PACE
- Additional reports:Telomere length, immune cell ratios, weight-loss response
- Turnaround:2–3 weeks
- Data handling:HIPAA-compliant; no third-party sharing
Our verdict“I recommend TruAge for buyers who want the widest stated set of methylation-based age metrics and do not mind a blood-spot sample.”
Aeternum DNA Biological Age Test Kit
Aeternum DNA Biological Age Test Kit is my pick for buyers who want a direct methylation-based age estimate but would rather provide saliva than a fingertip blood spot. The kit analyzes DNA methylation markers and returns a digital biological-age report with lifestyle recommendations. Its purpose is more focused than the broader TruAge collection: it makes sense for someone who wants an age-related report without selecting among a longer list of specialized metrics.
That simpler scope is also its main limitation. TruAge lists multiple distinct measures, including Dunedin PACE and telomere length, while Aeternum’s supplied details describe a biological-age report and recommendations without naming an equivalent set of separate metrics. I would not assume that the two reports answer precisely the same questions just because both use methylation. Aeternum is easier to approach at the collection stage, but TruAge gives more detail about what its report includes.
The saliva sample, instructions, and prepaid return mailer make the process manageable at home, and results are expected online in a few weeks. That mail-and-wait process is a real tradeoff for buyers who want a quick answer or dislike handling a sample. Aeternum is described as usable for tracking biological age over time, but repeated results are most meaningful when collection and interpretation are consistent; the listing does not supply a detailed explanation of how to read changes. I see this as the cleaner entry point for methylation testing, not the strongest pick for report breadth.
Pros:- Uses saliva rather than a fingertip blood spot.
- Analyzes DNA methylation markers for a biological-age report.
- Includes instructions and a prepaid return mailer.
- Provides digital lifestyle recommendations and is described as suitable for tracking over time.
Cons:- Results take a few weeks because the sample must be mailed and processed.
- The supplied details name fewer separate metrics than TruAge.
- Lifestyle suggestions do not replace medical advice or clinical testing.
Best for: First-time buyers who want a saliva-based DNA methylation test and a focused digital biological-age report.
Not ideal for: People who want several named age metrics in one kit, dislike mailing samples, or need results quickly.
- Test type:At-home DNA methylation test
- Sample:Saliva
- Analysis:DNA methylation markers
- Laboratory:CLIA-certified labs
- Results:Digital biological-age report with lifestyle recommendations
- Turnaround:A few weeks
- Included:Collection device, instructions, prepaid return mailer
Our verdict“I would choose Aeternum when easy saliva collection and a focused methylation report matter more than a longer list of age metrics.”
SelfDecode Healthy Aging and Longevity At-Home DNA Test
SelfDecode Healthy Aging and Longevity is the most approachable collection option in this lineup for people who prefer a cheek swab and do not want a saliva sample or finger prick. Its report uses genetic variants linked to longevity and healthy aging, then provides 50 personalized recommendations. That makes it a useful choice for exploring inherited tendencies and wellness topics, but it differs from Aeternum and TruAge in a key way: the stated test analyzes genetic variants rather than using DNA methylation to estimate current biological age.
I rank it below those two methylation kits for the specific search intent of a biological-age test. A genetic profile can help frame possible traits associated with aging, yet it should not be read as a direct measurement of how quickly a person is aging today. Compared with PlexusDx, SelfDecode lists fewer reports but gives a concrete count of recommendations and clearly describes its cheek-swab process. That is useful for buyers who want a smaller, more guided set of wellness suggestions instead of an extensive library of DNA reports.
The kit includes a prepaid return mailer and says samples are processed in a CLIA-certified lab. Its privacy description cites encryption, HIPAA/GDPR alignment, and an option to delete data, which will matter to people weighing whether to share genetic information. The tradeoffs are the mailed sample and online-only report, plus a clear limit: results are for educational and wellness use, not diagnosis or treatment. I would choose SelfDecode for genetic context and accessible collection, not if the central requirement is a methylation-derived age score.
Pros:- Cheek-swab collection avoids saliva collection and finger-prick sampling.
- Includes 50 personalized recommendations in an online report.
- A prepaid return mailer is included.
- Lists encrypted data, HIPAA/GDPR alignment, and an option to delete data.
Cons:- Analyzes genetic variants rather than directly measuring age through DNA methylation.
- The report is for educational and wellness use, not medical diagnosis or treatment.
- The sample must be mailed and results are viewed online.
Best for: Buyers who want a cheek-swab genetic wellness report with longevity-related recommendations and care about having a stated data-deletion option.
Not ideal for: Anyone specifically seeking a DNA methylation-based biological-age estimate or medical guidance from a test result.
- Sample collection:At-home cheek swab
- Sample processing:CLIA-certified lab
- Analysis:Genetic variants associated with longevity and healthy aging
- Analysis scale:AI analysis across 200 million genetic variants and peer-reviewed research
- Report:Online report with 50 personalized recommendations
- Return shipping:Prepaid return mailer included
- Privacy:Encrypted; HIPAA/GDPR-aligned; data deletion option
- Intended use:Educational and wellness purposes only
Our verdict“I recommend SelfDecode for buyers seeking accessible genetic longevity insights, while methylation-focused shoppers should start with TruAge or Aeternum.”
PlexusDx Methylation and Longevity Genetic Test
PlexusDx Methylation and Longevity Genetic Test is the broadest genetic-report option in this group on the information provided. It lists more than 150 reports across healthy aging, longevity, methylation, and related traits, including topics such as telomeres, cognition, and muscle loss. Personalized diet, supplement, and lifestyle recommendations give the report a practical wellness angle, particularly for a buyer who wants to explore several areas rather than focus on one age result.
Its breadth should not be confused with a more complete biological-age measurement. Compared with TruAge, which names specific methylation-based metrics such as epigenetic age and Dunedin PACE, PlexusDx describes a large genetic testing report set but does not specify the exact biological-age calculation in the supplied information. It is also less clear on timing: unlike TruAge’s two-to-three-week estimate and Aeternum’s “few weeks,” no result timeline is stated. I would place it behind those kits for a buyer whose first priority is a clearly described age estimate.
PlexusDx may still be the better fit for someone who values topic breadth over a focused age report. Its prepaid return mailer simplifies sending the sample, though collecting and mailing DNA remains part of the process. The product details also cite over 200 million genetic variants but do not explain how each report is generated or how recommendations are prioritized. That uncertainty makes it harder to compare its results directly with a methylation-based score. I would pick it for expansive genetic wellness coverage, while a buyer wanting a defined set of age metrics should favor TruAge.
Pros:- Lists more than 150 reports across aging, longevity, and related traits.
- Includes topics such as telomeres, cognition, and muscle loss.
- Offers personalized diet, supplement, and lifestyle recommendations.
- Includes a prepaid mailer for returning the sample.
Cons:- The supplied details do not state a result turnaround time.
- The exact biological-age calculation is not described in the supplied information.
- Requires at-home sample collection and mailing.
Best for: People who want a broad collection of genetic reports on longevity, methylation-related traits, and lifestyle topics in one kit.
Not ideal for: Buyers who need a stated result timeline, a clearly described methylation-derived age calculation, or a narrowly focused report.
- Test type:At-home DNA genetic test
- Reports:More than 150 DNA reports
- Variants analyzed:Over 200 million
- Topics:Healthy aging, longevity, methylation, telomeres, cognition, muscle loss
- Recommendations:Personalized diet, supplement, and lifestyle guidance
- Sample return:Prepaid return mailer
- Product dimensions:6.63 x 4.5 x 0.88 inches
- Item weight:2.08 ounces
Our verdict“I would choose PlexusDx for breadth across genetic longevity topics, not as my first pick for a clearly specified methylation-based age score.”
How We Picked
I ranked these kits by how directly their stated methods and reports address the search for a biological-age test. A product that explicitly analyzes DNA methylation and reports age-related measures is a closer match for a buyer seeking an estimated biological age than a broad genetic test that examines variants associated with longevity. That distinction matters: a genetic-risk or wellness report may offer useful context, but it is not interchangeable with an age estimate derived from methylation markers.
I also compared the breadth and specificity of the reports. TruAge earns the top position because its listed results include multiple metrics, including epigenetic age and Dunedin PACE, alongside telomere length and trait-specific insights. Aeternum ranks as the simpler methylation option, with saliva collection and an online report. SelfDecode and PlexusDx both offer broad genetic analysis and lifestyle recommendations, but the supplied details describe their work as genetic-variant analysis rather than a methylation-based biological-age calculation. I treat them as useful adjacent choices, not equivalent substitutes.
Practical factors also shape the order: sample collection, stated turnaround, and privacy details. A saliva sample or cheek swab may feel more approachable than a fingertip blood spot, while a return mailer means every kit still involves sending biological material to a laboratory. Where product information does not provide a result timeline or a precise explanation of the age calculation, I say so rather than filling in the gap. I do not rank these products by medical claims: the descriptions frame them as wellness or informational tools, and a test result should not be used on its own to diagnose or treat a condition.
| biological age test | Analysis | Test type |
|---|---|---|
| TruAge Complete Collection | DNA methylation-based age metrics | — |
| Aeternum DNA Biological Age Te | DNA methylation markers | At-home DNA methylation test |
| SelfDecode Healthy Aging and L | Genetic variants associated with longevity and healthy aging | — |
| PlexusDx Methylation and Longe | — | At-home DNA genetic test |
Factors to Consider When Choosing Best Biological Age Tests
I would start by deciding whether you want a direct age-related estimate or genetic context about traits connected with aging. The products share wellness language, but their methods and report scopes differ, so a high report count does not automatically make a kit a better biological-age test.
Methylation estimate or genetic profile?
DNA methylation tests are the more direct match for someone looking for a biological-age estimate in this lineup. Aeternum and TruAge both name methylation markers as part of their analysis, and TruAge lists several specific measures, including epigenetic age and Dunedin PACE. By contrast, SelfDecode describes analysis of longevity-linked genetic variants, while PlexusDx describes a large collection of genetic reports. Those genetic tests may offer useful wellness context, but the supplied descriptions do not make them equivalent to a methylation-based age estimate.
Before choosing, check what the report actually says it measures. A term such as “longevity” can cover many topics, from inherited variants to methylation markers to lifestyle recommendations. If your goal is to track a biological-age estimate over time, I would favor a kit with an explicit method and clearly named age measures. If you mainly want to learn about genetic traits associated with aging, the broader genetic products may fit better.
Choose a sample method you will complete
Collection comfort is practical, not cosmetic: a kit cannot help if its sample method puts you off completing it. SelfDecode uses a cheek swab, Aeternum collects saliva, and TruAge asks for a fingertip blood spot. PlexusDx is described as an at-home DNA test, but the supplied details do not specify its collection method. Each option still involves returning a sample by mail, so none provides an instant result at home.
If you want to avoid a blood sample, compare Aeternum and SelfDecode, while remembering that they answer different biological questions. Saliva is the stated collection method for Aeternum’s methylation test; the cheek swab is used by SelfDecode for genetic analysis. I would not choose between them based only on ease of collection if you are specifically seeking an age estimate.
Match report breadth to how you will use it
More reports can mean more context, but also more interpretation. TruAge’s measures cover several distinct aging indicators and related traits. Aeternum is more focused in the available description, while SelfDecode offers 50 recommendations and PlexusDx lists more than 150 reports across a wider set of genetic topics. The largest stated report library is not necessarily the best choice if your main question is simply how a particular biological-age measure is calculated.
Think about whether you want a single score, multiple metrics to compare, or a broad set of genetic wellness suggestions. A wider report can be appealing if you plan to explore many topics, but it may make it harder to identify which findings matter most. If you want to monitor change over time, check that the product describes a repeat-testing use and consider whether you can interpret changes consistently. A score or recommendation should not be treated as a clinical result.
Read turnaround and privacy details before sending a sample
All four kits involve mailing biological material, so results will not arrive as soon as the sample is collected. TruAge lists a two-to-three-week turnaround, and Aeternum says results arrive in a few weeks. The supplied SelfDecode and PlexusDx descriptions do not specify a timeline. If waiting time affects your decision, that missing detail is a fair reason to ask the seller or provider before purchasing.
Genetic and biological data can be sensitive. SelfDecode lists encryption, HIPAA/GDPR alignment, and a data-deletion option; TruAge lists HIPAA-compliant handling and says it does not share data with third parties. The supplied descriptions do not give the same level of privacy detail for every kit, so I would review each provider’s current data policy before registering a sample. A laboratory certification or privacy statement does not turn a wellness report into a medical diagnosis.
Keep wellness reports in perspective
Biological-age tests produce estimates that depend on their methods and the way results are reported. The product descriptions here do not establish that scores from different companies can be compared directly, so I would avoid treating a result from one kit as a universal measure or ranking the products by the size of a number. Method matters more than a headline score.
SelfDecode explicitly says its results are for educational and wellness use, not diagnosis, treatment, cure, or prevention of disease. The other kits are also presented as at-home testing products with lifestyle guidance rather than as stand-alone clinical care. If a result raises a health concern, discuss it with a qualified health professional instead of making a diagnosis or changing treatment based only on a consumer report.
Frequently Asked Questions
What is the difference between a methylation test and a genetic longevity test?
A methylation test analyzes DNA methylation markers, which the product may use to estimate biological age or report related measures. A genetic longevity test analyzes inherited variants linked to traits or wellness topics. In this lineup, Aeternum and TruAge explicitly describe DNA methylation analysis, while SelfDecode and PlexusDx describe genetic-variant analysis. Those methods provide different kinds of information and should not be treated as interchangeable.
Which kit is the closest match for a direct biological-age estimate?
Based on the supplied product details, TruAge and Aeternum are the clearest matches because both explicitly use DNA methylation markers. TruAge names several measures, including epigenetic age and Dunedin PACE, while Aeternum describes a digital biological-age report from saliva. I rank TruAge higher for its wider stated set of age metrics; Aeternum is the simpler saliva-based alternative.
Can I compare results from two different biological-age tests?
I would be cautious about comparing numbers across brands. These kits can use different sample types, analysis methods, report definitions, and calculations, and the supplied descriptions do not establish that their results use a shared scale. If you want to follow a result over time, using the same test and following its collection instructions may make more sense than comparing scores from unrelated products. Ask a qualified health professional about health concerns.
How long do results take?
The listed turnaround varies by product. TruAge states two to three weeks, and Aeternum says results are available online in a few weeks. The supplied descriptions for SelfDecode and PlexusDx do not state a result timeline, so I would confirm that information with the provider before ordering if timing matters. Each product requires a sample to be returned and processed.
Can these tests diagnose a health condition or guide treatment?
No product description here supports using a report as a diagnosis or as a substitute for medical care. SelfDecode explicitly limits its results to educational and wellness use and says they are not intended to diagnose, treat, cure, or prevent disease. Lifestyle recommendations are not a treatment plan. If a result concerns you or affects a health decision, discuss it with a qualified health professional.
Conclusion
For the broadest stated set of methylation-based age measures, I would choose TruAge Complete Collection. Buyers who want a simpler saliva collection and a focused methylation report should look at Aeternum. If your priority is a gentle cheek-swab collection and genetic longevity recommendations, SelfDecode is the better fit, with the caveat that it is not described as a direct methylation age test. For a wide genetic-report library covering many aging-related subjects, PlexusDx has the broadest listed scope, though its result timeline and age calculation are not specified in the supplied details.
My overall advice is to choose the test whose method matches your question, then check sample requirements, report scope, turnaround, and data policies before sending a sample. None of these kits should stand in for clinical advice or diagnosis, and their results should not be assumed to share a common scale.
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