if men’s peak testosterone levels are 18-19, why do they continue to grow denser beards and body hair into their 30s?
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Testosterone peaks then, but it does not disappear after the peak. There continues to be testosterone production for the rest of life, except it can fall a bit in old age
Beard growth and testosterone are closely linked. However, they aren’t the only factors that determine the thickness, shape and rate of beard growth. Genetics is also a huge factor. Also, growing a good-sized beard takes time. You’re more likely to see older people with thicker beards because they’ve had more time to grow out their beards.
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