- A study in short-lived fish found that movement and sleep patterns in mid-life predicted whether they would live longer or die earlier.
- Fish that stayed active and slept mainly at night tended to live longer.
- Ageing did not appear to happen smoothly, but in sudden shifts between stages.
Researchers at Stanford continuously tracked 81 African turquoise killifish throughout adult life.
Even though the fish were genetically similar and lived in the same conditions, they aged very differently.
By early mid-life, those differences were already showing up in how they moved and rested.
Fish that later lived longer were generally more active during the day and swam with more vigour.
Fish that later died earlier were more likely to become less active and to sleep more during the day.
The researchers found these behaviour patterns were strong enough to predict lifespan.
They also found that ageing did not unfold as a slow, steady slide.
Instead, the fish tended to stay stable for a while, then shift quite quickly into a new stage of ageing.
That is interesting because it lines up with growing evidence that ageing may happen in waves rather than as one long gradual process.
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This was a fish study, so it does not tell us that human lifespan can be predicted the same way.
But it does raise an interesting possibility.
As wearables track sleep, movement and daily rhythms more closely, similar patterns may one day help flag early signs of unhealthy ageing in people.
