my dad was dead set against working out before age 16. he swore it would stunt my growth. im talking natural workouts, no supps at all. but of course i didnt listen and started at 13 and popped my cherry at age 25. i still to this day believe it was the best choice i ever made. i encourage my son who is now 7 that excercise is very important no matter what age you are. he plays football and baseball and is huge compaired to others his age. i definately passed on the growing genes to him.