Male pattern hair loss is caused by three things: genes, hormones, and age. Roughly one-third of the male population starts to lose hair by the age of 45. By the time retirement rolls around, nearly all men have some degree of hair loss.
Men graced with male pattern baldness genes inherit hair follicles that are oversensitive to the male hormone dihydrotestosterone (DHT). When testosterone is converted into DHT, it shrinks the hair follicles, resulting in shorter and finer hair until, eventually, hair growth stops altogether. The good news is, the hair follicles don't die off, so hair growth may still be possible.
The role of testosterone in premature balding has led to the myth that going bald is a sign of virility. However, men with male pattern baldness aren't any more well-endowed with testosterone than other guys. Their hair follicles are simply more sensitive to the hormones.
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