Biological Age Tests: How Much Should You Trust Them?
The promise of a single number for how old your body really is, is compelling. The science is interesting but younger than the marketing suggests.
What this is
Biological age tests claim to measure how old your body is functioning compared with your calendar age, often using markers like epigenetic clocks. This page explains what these tests attempt to measure, how reliable and reproducible they currently are, and how to interpret results sensibly rather than treating a single number as definitive.
Why it happens
The concept is appealing and the science genuinely interesting, but the field is still maturing, results can vary between tests and over time, and the number is best treated as a rough signal, not a verdict.
Common causes
Biological age tests use various methods, epigenetic markers, blood-based measures, and others, of differing maturity and reliability, which is why results should be read cautiously.
Possible paths forward
Treating biological age as an interesting signal rather than a precise measure; focusing on the proven levers that improve health regardless of the number; being cautious of services that use the result to sell treatments; and tracking trends over time if you test at all.
Questions worth asking.
These FAQs are meant to help you with common situations affecting our community - men over 40 - so when you do speak with your doctor, you have a head start. FAQs are for educational purposes only and aren't a substitute for professional medical advice.