my son is very smart for his age, and i think he is plenty strong enough. he hits the gym with me and is an impressive 102lbs. at 6 years old we let him take the yearly dept. refresher on fire ext. and he put out a class b burn with a 5lb ext. so do you think he is to young? i gave him the option to take the full class, and he wants to, only thing i'll have to have someone do for him is read the test and key. is it a bad idea, or should i let him at it?