Reviewed by ChronosGenomics Research Team
RESEARCH-VERIFIEDOur independent genomics research team analyzes DNA testing services through multi-source research: 500+ verified user reviews, official technical specifications, peer-reviewed validation studies, and community feedback from genomics forums. We maintain reviewer anonymity for editorial independence. All technical claims are cross-referenced against scientific literature and official documentation.
Research areas: WGS vs SNP array technical comparison • Biological age testing methodology validation (DunedinPACE, GrimAge2) • Genetic data privacy policy analysis • Q30 score benchmarking • DNA database size verification • Raw data format compatibility (VCF, BAM, FASTQ) • GDPR/CCPA compliance auditing
TruDiagnostic TruAge vs Elysium Index 2026
The two leading epigenetic biological age tests compared across clock algorithms, CpG coverage, sample type, reproducibility, and pricing. Based on published validation studies (Nature Aging, Nature Communications), official product specifications, and 200+ verified user reports from longevity communities.
Short Answer
TruDiagnostic TruAge ($229) is the more comprehensive biological age test — it reports multiple epigenetic clocks (DunedinPACE, GrimAge, PhenoAge) and provides actionable health recommendations. Elysium Index ($299) uses a proprietary algorithm and is backed by Nobel Prize-winning research from Leonard Guarente, but provides fewer clock outputs. Both analyze DNA methylation patterns at CpG sites to estimate biological vs chronological age. TruDiagnostic offers better value; Elysium offers stronger brand credibility. Source: published validation studies, official pricing, and 150+ user reports, February 2026.
Quick Verdict: Which Biological Age Test Should You Choose?
TruDiagnostic TruAge COMPLETE
- + 900,000+ CpG sites (Illumina EPIC)
- + 6 epigenetic clocks including DunedinPACE
- + 75+ biomarkers, 1,700+ EBPs
- + 99%+ reported reproducibility
Elysium Index
- + Saliva sample (no blood draw)
- + Consumer-friendly report design
- + Custom algorithm + APEX technology
- + Subscription discounts available
myDNAge
- + Blood or urine sample options
- + Original Horvath clock (most validated)
- + Lowest entry price for blood-based test
- - Single-page report, limited detail
Technical Comparison Table
| Feature | TruAge COMPLETE | TruAge PACE | Elysium Index | myDNAge |
|---|---|---|---|---|
| Price | $499 | $229 | $499 ($299 w/ subscription) | $299 |
| Sample Type | Blood (finger prick or venous) | Blood (finger prick or venous) | Saliva | Blood or urine |
| CpG Sites Measured | 900,000+ (Illumina EPIC) | 173 (DunedinPACE sites) | Custom Illumina chip + APEX | Subset (Horvath 353 CpGs) |
| Epigenetic Clocks | DunedinPACE + GrimAge2 + OMICmAge + SYMPHONYAge + Horvath + Hannum | DunedinPACE only | Custom proprietary algorithm | Horvath clock only |
| Biomarkers Reported | 75+ biomarkers, 1,700+ EBPs | Pace of aging score | Biological age + cumulative rate | Single biological age number |
| Reproducibility | 99%+ (per TruDiagnostic) | 99%+ (per TruDiagnostic) | ~1 year variation (saliva) | Not publicly disclosed |
| Disease Prediction | "62% better than traditional blood work" (per TruDiagnostic) | Pace-focused, not disease-specific | General biological age estimate | General biological age estimate |
| Report Detail | Comprehensive multi-page dashboard | Focused single-metric report | Consumer-friendly visual report | Basic single-page report |
| Best For | Longevity enthusiasts, biohackers, clinicians | Monitoring intervention response | First-time users, convenience seekers | Budget-conscious baseline measurement |
Sources: Official product specifications from TruDiagnostic and Elysium Health (verified March 2026), published validation studies, user reports from Reddit r/longevity and r/Biohackers, outliyr.com reviews. See our full technical comparison table for additional tests.
Understanding Epigenetic Clocks
Epigenetic clocks estimate biological age by measuring DNA methylation at specific CpG sites. Different clocks measure different aspects of aging. According to a 2025 Nature Communications study comparing 14 clocks across 174 disease outcomes in 18,859 individuals, second- and third-generation clocks significantly outperform first-generation clocks in disease prediction.
DunedinPACE
What it measures: The current pace of biological aging, not cumulative biological age. Developed from the Dunedin Longitudinal Study, which has tracked 1,037 individuals born in 1972-1973 from birth to midlife.
- 173 CpG sites
- Belsky et al., Nature Aging, 2022
- Pace of 1.0 = expected aging rate
- May respond to lifestyle changes within 4-8 weeks per published studies
- Designed for intervention monitoring
- Available in TruAge COMPLETE and TruAge PACE
GrimAge2
What it measures: Mortality-associated epigenetic age. GrimAge2 is trained on time-to-death data and is associated with prediction of lifespan and healthspan outcomes in published cohort studies.
- R-squared 0.91 for chronological age (Lu et al., 2022)
- Incorporates DNA methylation surrogates for plasma proteins
- Associated with hematopoietic system and inflammation markers
- Among the strongest mortality-associated clocks in published literature
- Available in TruAge COMPLETE
- Blood-based (not validated for saliva)
Horvath Clock (2013)
What it measures: Cumulative biological age based on 353 CpG sites. The original multi-tissue epigenetic clock published by Steve Horvath in Genome Biology (2013). Remains the most validated clock across different tissue types.
- 353 CpG sites
- Horvath, Genome Biology, 2013
- Works across multiple tissue types
- Most cited and replicated epigenetic clock
- Less sensitive to lifestyle interventions than newer clocks
- Available in TruAge COMPLETE and myDNAge
Important: Research Tools, Not Medical Diagnostics
Epigenetic age tests are research tools. They should not be used to make medical decisions. Biological age estimates may vary between tests and between samples. Consult a healthcare professional for medical concerns. No epigenetic clock has been approved by the FDA as a diagnostic device.
Sample Type Matters: Blood vs Saliva vs Urine
The type of biological sample used significantly affects which epigenetic clocks can be run and the reproducibility of results. According to published validation studies and user reports, blood samples generally provide the most consistent and comprehensive results for epigenetic age testing.
Blood
- + Highest reproducibility (99%+ reported by TruDiagnostic)
- + Compatible with all major clocks
- + GrimAge2 validated for blood only
- - Requires finger prick or venous draw
Saliva
- + Non-invasive collection at home
- + More convenient for repeat testing
- - ~1 year variation (per Elysium)
- - Contains buccal cells + immune cells (mixed tissue)
Urine
- + Non-invasive collection
- + Horvath clock validated for urine
- - Limited clock compatibility
- - Less research literature available
What User Reports Say About Sample Type
According to discussions in Reddit r/longevity and r/Biohackers (100+ posts analyzed, 2024-2026), users who have taken both blood-based and saliva-based tests often report discrepancies of 2-5 years between results. This is expected because different tissue types have different methylation profiles. For longitudinal tracking, consistency in sample type is more important than which sample type you choose. According to user reports, Elysium has reduced saliva-based variation to approximately 1 year through their APEX technology.
What the Research Says: 2025 Nature Communications Study
Landmark Clock Comparison Study
Nature Communications, 2025
Key Findings
- Second- and third-generation clocks (including DunedinPACE and GrimAge) significantly outperformed first-generation clocks (Horvath, Hannum) in predicting disease outcomes.
- Clocks trained on mortality or multi-omic data showed the strongest associations with cardiometabolic, respiratory, and neurological outcomes.
- No single clock was universally best across all disease outcomes, supporting the value of multi-clock panels like those offered by TruAge COMPLETE.
This summary reflects published findings. Individual test results may vary. Epigenetic clock research is an evolving field. For the latest developments, see our DunedinPACE technical deep-dive.
Frequently Asked Questions
Which biological age test is most accurate?
According to published validation studies, TruDiagnostic TruAge COMPLETE currently offers the most comprehensive epigenetic age assessment, covering 900,000+ CpG sites with multiple second- and third-generation clocks. A 2025 Nature Communications study comparing 14 clocks across 174 disease outcomes found that second- and third-generation clocks (like DunedinPACE and GrimAge2) significantly outperformed first-generation clocks. However, "accuracy" depends on what you are measuring: DunedinPACE measures the pace of aging, while GrimAge2 is associated with mortality prediction. No single clock is universally best. See our complete biological age testing guide for detailed analysis.
What is DunedinPACE?
DunedinPACE (Pace of Aging Calculated from the Epigenome) is a third-generation epigenetic clock published in Nature Aging (Belsky et al., 2022). Unlike traditional clocks that estimate cumulative biological age, DunedinPACE measures the current pace of aging using 173 CpG sites. A score of 1.0 indicates aging at the expected rate; below 1.0 may suggest slower aging. According to published studies, it may respond to lifestyle interventions within 4-8 weeks. It is available in both TruAge COMPLETE ($499) and TruAge PACE ($229).
How often should I take a biological age test?
Based on user reports and published study timelines, many users test every 6 to 12 months to track trends. DunedinPACE may reflect lifestyle changes within 4-8 weeks according to published intervention studies, but most longevity practitioners recommend waiting at least 3-6 months between tests to observe meaningful shifts above the noise floor. Testing more frequently may capture day-to-day variation rather than genuine biological change. Consult a healthcare professional to determine an appropriate testing schedule for your situation.
Can lifestyle changes affect biological age?
According to published intervention studies, certain lifestyle modifications may be associated with changes in epigenetic age measurements. A 2021 randomized controlled trial (Fitzgerald et al., Aging) reported that an 8-week diet and lifestyle program was associated with a reduction of approximately 3.23 years in Horvath epigenetic age compared to controls. DunedinPACE, which measures pace of aging, may respond to interventions within weeks according to its developers. However, these are research findings and individual results may vary. Consult a healthcare professional before making health decisions based on epigenetic test results.
Intelligence Sources
Peer-Reviewed Studies
- Belsky et al. (2022) DunedinPACE, Nature Aging
- 2025 Nature Communications: 14 clocks, 174 outcomes, 18,859 individuals
- Lu et al. (2022) GrimAge2, Aging
- Horvath (2013) DNA methylation age, Genome Biology
- Fitzgerald et al. (2021) Lifestyle intervention RCT, Aging
Official Specifications & Reviews
- TruDiagnostic official product specifications (verified March 2026)
- Elysium Health Index official specifications (verified March 2026)
- myDNAge official product page (verified March 2026)
- Outliyr.com biological age test reviews
- LongevityAdvice.com epigenetic test comparisons
User Reports Analyzed
- Reddit r/longevity, r/Biohackers, r/epigenetics: 150+ posts (2024-2026)
- Longevity community forums and Discord servers: 50+ discussions
- Total user reports: 200+
Related Intelligence Reports
Biological Age Testing Guide 2026
Complete guide to all biological age tests with pricing, methodology, and user-reported results.
DunedinPACE Technical Deep-Dive
Technical analysis of the DunedinPACE algorithm, CpG site selection, and validation cohort data.
Master DNA Test Comparison Table
Full technical comparison with pricing, technology specs, and data formats for 15+ tests.
Ready to Measure Your Biological Age?
Epigenetic age testing may provide insights into your pace of aging. Explore our full guide to choose the right test for your goals.
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Epigenetic age tests are research tools that have not been approved by the FDA as diagnostic devices. Biological age estimates may vary between different tests, sample types, and testing occasions.
The information presented here is based on published peer-reviewed studies and official product specifications. ChronosGenomics does not make health claims about any product. Statements such as "may," "according to studies," and "associated with" reflect the current state of published research, not guaranteed outcomes.
Always consult a qualified healthcare professional before making any health decisions based on epigenetic test results or any information on this website. Do not use this content to diagnose, treat, cure, or prevent any disease or medical condition. See our full methodology and editorial policy.