Dah...
Enzymes in male bodies convert testosterone – the principal male sex hormone - into dihydrotestosterone.
Dihydrotestosterone is a hormone that, among other things, makes hair shorter and thinner.
These enzymes don’t accumulate with age. What occurs is a slow process and it takes a long time before a man starts experiencing the resulting hair loss.
Another factor is the number of receptors a man has on his head. The more the receptors, the greater the hair-loss.
Men can also have plenty of enzymes and testosterone, but still keep the hair on their crowns if they have few of these receptors up there.
Why not women?
Because the male sexual hormone testosterone has the biggest impact on hair, and women don’t lose hair the same way.
When women reach menopause, their levels of the female sex hormone estrogen drops, and the testosterone they always had in their bodies starts to have more effect.
This can lead to thinner hair growth for women, but it’s more equally distributed, rather than in a receding hair line as in men.
From this Source:
http://sciencenordic.com/why-do-...