I still argue that it is largely genetics the point at which it starts growing might vary a bit but if you cant grow much facial hair after about 23~24 you probably never will hormones have a major effect on when your hair grows some guys get sent a strong message younger than others.I recall this one guy in my class joker had a full and I mean full upper lip included beard at freaking 15! Still your DNA is going to determine how much hair you will get and where.He would have to look at all his male relatives on both his mother and fathers side to determine roughly what he can expect to get(if he can get any more)
Also testosterone has an effect but again you could have it out the ying yang and still not be able to grow a full beard if genetically you have fewer hair follicles.
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