You are not going to have MPB unless you are genetically predisposed to it. Guys who are genetically predisposed to MPB have different kinds of hair follicles in the MPB area than they do on the resp of their head. What "triggers" the top follicles to go dormant and the hair to fall out is DHT. Thus, guys who are genetically predisposed to MPB only start losing their hair when they start producing a lot of extra testosterone. So, guys who start losing their hair at a young age generally produce boat loads of testosterone - and thus are very, very, virile.