Six "biological age" tests on the same 970 adults: the DNA-reading ones predicted who kept their body and mind working.

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1. 1Six 'biological age' tests on the same 970 adults — the DNA-reading ones predicted who kept working0:00
2. 2The DNA-reading tests tracked lower function, GrimAge strongest; the inflammation test showed no link0:17
3. 3The six tests disagreed — and one even flipped direction with age0:43
4. 4A 'biological age' test is a trained guess from chemical tags on your DNA — not a reading off a dial1:04
5. 5Each test only predicts what it was trained on — so the six disagree by design1:32
6. 6For GrimAge, a decade of extra age tracked about three fewer function points, mobility hardest2:05
7. 7The same team's next step: a clock trained on function itself2:35
8. 8'Your biological age' isn't one number — it's a guess shaped by what the test was trained on2:56