I started to learn how to lift wieghts when I was 3. Basic form and what not, nothing that could be called strength training. Mostly wanting to participate with my dad. Did Soccer from kindergarden till 6th grade. Judo from 8 till 10, while I was in soccer. Played American football from junior high till junior year of highschool, and switched over to savate/boxing de francias till nearly 19. Suffered my share of injuries, a dislocated shoulder very minor no ligiment damage, 6 broken ribs, a broken clavicle and spur's across most major striking surface, metacarpal's included. But that's about it, nothing very serious at all. And steadily drifting more and more to heavy bodybuilding.

I don't see anything wrong with starting kids young. As long as it's light. Soccer being the most dangerious sport in the world but most parents don't see a problem starting their kids on it at 6 or 7. Proper strength training will never lead to stunted growth or serious injurries. One of the main reasons being if their lifting properly, they can't lift enough to hurt themselves.

Fish oil by the way is a good send I would not lift competitively if it wernt for these pills helping my heart and joints.
Dear god yes, fish oil is truly a great thing.