This past summer, I was visiting my folks and took my wife and my mom to the beach - my mom won't go to the beach by herself so I was being the good son. I always thought my dad's chest was hairy when I was a kid but was shocked when my mom said, "wow, you're hairier than your father".
I was a late bloomer when I was a teen. My best friend was the same age as me and had underarm and leg hair. I think I had peach fuzz for underarm hair at the same time. First was around my dick and then it slowly expanded.
As for my chest and stomach, I first got a few hairs around the nipples and then a bit later, a little bit of a treasure trail. The hairy nipples was about it until my early twenties. My stomach started to get hairy and then slowly, a bit in the middle of my chest. I used to save my chest and trim my stomach because it didn't look like I ever had chest hair, so I could pull it off by shaving. I stopped in my mid twenties because by then, the chest hair began to move up and around and it was more of a pain in the arse to shave - more real estate. I'm just damned happy that I don't have any back hair!
I did get a bit teased in HS because of it, but not much. My nickname in the locker room was "MC Hung Well" (MC Hammer was popular at the time). I never really showed it to anyone, but I guess with the really, reallllly skinny frame and the good-sized bulge in my tighty whities helped to earn the nickname.