Hair

[Grandpappy]

Why does the top of the head go bald ,but the bottom,namely the chin, doesn't?
Cheers

[Octavius]

Different types of hair and skin cells in those locations.

DHT causes it generally - it is a powerful sex hormone, body, and facial hair growth promoter that can adversely affect the hair on the head. Also maternal and paternal genes play a part.

So whilst adolescent boys are gettin' jiggy with the increase in DHT to make them rampant neanderthals with bum fluff tache's (vellus hair) - the downside for many is the onset of baldness to the crown.