the only thing is to prevent him from getting burnt out. When I was 12-18, I used to ski with a kid who is about 6 or 7 years younger because he was a trip to ski with. When he was really little, his helmet was 1/3 the size of his body. The kid could rip with the best of em when he was 6. The only problem was by the time he was 17ish, he was pretty burnt. He had focused so heavily in racing that a lot of skiing was no longer fun. He's still out there skiing, and he's still one hell of a skier, but he doesn't have the love of skiing that he used to (or he doesn't appear to).