Often hair loss that primarily affects the top and front of the scalp will happen to men (and female) during aging. Male pattern hair loss is believed to be due to a combination of genetics and the male hormone dihydrotestosterone.
Men with androgenic alopecia typically have higher 5-alpha-reductase, lower total testosterone, higher unbound/free testosterone, and higher free androgens, including DHT.
The question is whether this kind of balding is only present in the hair of the scalp or can this proces also happen on the legs (or other parts of the body)?