Daily acty x sleep

 3 points — what the study found:

1. Scientists tracked 81 African turquoise killifish for their entire lives
   They recorded movement, sleep, and activity 24/7. Despite identical genetics and environment, the fish aged very differently — and those differences appeared early.  
2. Just a short snapshot of behavior predicted lifespan
   By early adulthood, patterns like how much they swam and when they slept were enough to forecast which fish would live longer. Less active fish that napped during the day tended to die sooner.  
3. Aging didn’t happen gradually — it occurred in sudden “stages”
   The fish stayed stable for weeks, then rapidly shifted to a worse aging stage. These behavioral changes allowed researchers to predict longevity from only a brief window of data.  

Why this matters
Researchers say similar signals in humans — like activity levels and sleep patterns — are already tracked by wearables, meaning daily habits might one day estimate biological aging.