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Does the body decline after 25?

While the sensational phrase 'it's all downhill from here' after 25 is a popular myth, the reality is far more nuanced. According to the National Institute on Aging, some physiological changes do begin in the mid-20s, but it is not a sudden drop-off. So, does the body decline after 25? Not in the dramatic way you might think, but subtle shifts do start taking place.