Understand biological age. Compare clocks. Find providers.
The independent guide to biological age tests. No vendor affiliations. Evidence-rated. Honest about what we know and what we don't.
Clock Types
Biological age tests differ fundamentally by what they measure. Understanding the clock type is the first step to choosing the right test.
Epigenetic Clocks
Measure patterns of DNA methylation at specific CpG sites. The most mature clock category with the largest body of independent validation.
Glycomic Clocks
Analyze IgG glycosylation patterns as markers of immune aging and inflammaging. Growing commercial availability with finger-prick blood sampling.
Phenotypic Clocks
Use routine blood biomarkers, anthropometrics, and functional tests. The most affordable and interpretable category, though they may capture disease burden as much as aging.
Compare Tests
Side-by-side comparison of commercial biological age tests. Normalized by sample type, price, evidence quality, and what each test can actually tell you.
| Test | Type | Sample | Price | Turnaround | Evidence |
|---|---|---|---|---|---|
TruDiagnostic TruAge Complete | Epigenetic | Finger-prick blood | $499 | 2-6 weeks | PROMISING |
GlycanAge GlycanAge | Glycomic | Finger-prick blood | $499 | 3-5 weeks | PROMISING |
Elysium Health Index | Epigenetic | Saliva kit | $299 | ~6 weeks | PROMISING |
InsideTracker InnerAge 2.0 | Phenotypic | Venous blood | $249 | Varies | EMERGING |
Tally Health TallyAge | Epigenetic | Cheek swab | $249 | 4-6 weeks | EMERGING |
Thorne Biological Age | Phenotypic | Venous blood | $95 | 3-7 days | EMERGING |
Negotiate with Time
You can't negotiate with time. But your cells? Absolutely.
Lifestyle interventions, targeted therapeutics, and emerging technologies can measurably slow, stabilize, or even partially reverse aspects of biological aging. We observe this across biomarkers, imaging, and functional outcomes. Here's what the evidence actually supports.
Lifestyle
STRONGExercise
Resistance training, zone 2 cardio, and VO2max improvement. Measurable impact on epigenetic age acceleration, functional capacity, and mortality risk.
Sleep
7-9 hours with consistent timing. Linked to epigenetic age, immune function, and cognitive decline across multiple clock types.
Nutrition
Mediterranean-type patterns, caloric balance, protein adequacy. The CALERIE trial showed DunedinPACE reduction with caloric restriction.
Therapeutics
PROMISINGRapamycin
mTOR inhibition with strong preclinical data and early human trials for immune aging. Dose and duration questions remain open.
Metformin
TAME trial ongoing. Observational data suggestive via AMPK/inflammation pathways. Mixed epigenetic clock results so far.
NAD+ Precursors
NMN and NR with strong mechanistic rationale. Human RCT evidence for functional outcomes still limited.
Emerging
EMERGINGEpigenetic Reprogramming
Partial Yamanaka factors. Animal data is striking, but human translation is far off. Existing clocks may not reliably measure reprogramming effects.
Senolytics
Dasatinib + quercetin, fisetin. IPF trial positive. Broader human evidence is early-stage with small sample sizes.
Find Testing Near You
Biological age testing availability varies by country, sample logistics, and provider type. Select your region to see what's available.
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Your test result is a number. But what does it actually mean — and what can't it tell you?
Read more →Why Trust IntrinsicAge
The biological age testing market is noisy. Many products are marketed as simple scores despite substantial methodological differences. We exist to bring clarity.
Evidence-rated
Every test and intervention is rated by evidence tier: strong, promising, emerging, or insufficient.
No vendor affiliations
We are not paid by test vendors. Our comparison framework is independent and transparent.
Physician-reviewed
All content is reviewed for medical accuracy against a framework drawn from leading longevity researchers.
Honest about uncertainty
We acknowledge what clocks can't tell you. Uncertainty is a feature of our editorial voice, not a weakness.
Medical disclaimer: IntrinsicAge provides educational content only. This site does not offer medical advice, diagnosis, or treatment. Biological age test results are not clinical diagnoses. Consult a qualified healthcare professional before making health decisions based on any test result.