I seem to recall prophesizing something along those lines...  

I know all too well growing up tall, too fast. I was 5'10" by age 13 or 14. Hit 6'2" sophomore year of high school.

I started riding street bikes at age 15. Let your son set hisown pace. Starting him out on an Aero125 isn't actually a bad idea... start smalland graduate to bigger bikes.

Enjoy the bikes.
-WD