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![NBCNews Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::14173315.png) NBC News [@NBCNews](/creator/twitter/NBCNews) on x 9.4M followers
Created: 2025-07-07 15:20:11 UTC

For many people, reaching their mid-40s may bring unpleasant signs the body isn’t working as well as it once did. 

A new study shows what may be causing the physical decline.

![](https://pbs.twimg.com/card_img/1940175258889121792/07GvDo0e?format=jpg&name=800x419)

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