Always been told that male pattern baldness is a genetic trait giving through the mother's side of the family. In other words, is your mom's dad, brother, any male, or even your mother bald? If so you "could have a genetic predisposition.
Me all the guys on my mom's side of the family are chrome domes. Been a worry of mine for years. Well, I am 30 yrs. old, got a thick head of hair, barber still uses thinning scissors on it. So I no longer worry. Plus they got them cool topeas that you snap on your head nowadays. Surgical implant the other side of the snapper.