I started at about 12 1/2 or 13. I'm currently 14 and 3/4 (my 15th b'day is in April this year) and I have quite a bit of pubic hair, little arm pit hair, some forearm and leg hair, no chest or facial hair. My penis is... well... I haven't exactly checked.
Ok, just checked; 3.5 inches limp and (the ruler's a little short) just over 5.5 inches hard. Nothing spectacular, really.
(ok, I know that may have been tmi.
sorry if that was tmi!