Stanford Medicine: What biological age tests can – and can’t – tell you

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What biological age tests can – and can’t – tell you

(Stanfurd - Go Bears!)

In brief

• Stanford Medicine researchers explain that biological age, which measures how the body’s cells and organs are changing over time, differs from a person’s chronological age.
• Tests based on epigenetic clocks, blood protein panels, or wearable metrics often yield conflicting results because each measures a different aspect of aging.
• Researchers note that despite growing consumer interest, biological age test results should be interpreted with caution rather than certainty.

https://news.stanford.edu/stories/2026/09/biological-age-tests-tips-advice

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Worth also pointing out this that an article about these clocks was covered here, from someone in the insurance industry:

Your Biological Age Is Mostly Noise: Why the Insurance Industry Isn't Buying the Longevity Clock Hype

This review asks whether DNA-methylation “biological age” clocks are accurate and useful enough to be used in life insurance underwriting. Working through a case of a fit 50-year-old told he has a biological age of 46 and is aging at 0.7 years per year, the author walks through three generations of epigenetic clocks and concludes that these tests measure something real at the population level but are too noisy, poorly defined, and population-dependent to be trusted for any single individual. The verdict is that clocks add nothing beyond the traditional risk factors insurers already use, so they are not ready for prime time. The longevity industry has a compelling product. Send in some saliva, receive a number that says your body is younger than your birth certificate, and receive the implicit promise that with the right supplements and habits you can push that number lower still. The author, a medical director at a large reinsurer, sets out to test whether that number means what buyer…