The decline in physical strength and biological functions that occurs between the ages of 20 and 40 is significant and is noticeable by all but the most highly trained athletes.

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Quizplus · Accepted Answer

Although there is a slight decline in strength and biological functions during this period, the decline is slight enough and gradual enough that most people do not notice any decline at all. The exception would be trained athletes, whose peak performance generally occurs in the early to mid-20s.

The Decline in Physical Strength and Biological Functions That Occurs