My son is 5, and although I started him on a hand me down fiberglass recurve @ 3, he teased for a compound. He spotted Fred Eichler on a hunting video using a compound, so he wanted one (Thanks Fred!). I was dissapointed, as I tried to steer him towards a recurve, but thought "well, he started off with training wheels on his bike, so what the hell!", so he got his compound for X-mass! Santa brought him a Bear Warrior wheel bow. He shot it that morning, loved it, and before our ham was out of the oven for our family get together at noon, he broke it. He must have twisted it at full draw, and the cables came off the wheels! What a frigging mess! My father and I could not figure out what went where, or how (cams, groves, multi cables, etc.).
Another family member is going to fix it,as he has a bow press. I have turned this into a learning lesson, as I have explained to the boy how much more simple and durable traditional bows are, and that if this had happened up north during a hunt, his hunt would have been finished. With a recurve or longbow, it wouldn't have happened. I have a hunch that he will come around, sooner or later.