8 Y.O. Skateboard Champ

The Seattle P.I. has a story on Mitchie Brusco, an eight year old skateboard champ. Mitchie has been skateboarding since he was three, and has almost a dozen corporate sponsorships. What struck me in the story is that he is also in first grade. First grade! I'm not sure of the norm here in King County, but isn't he a bit old for that? What isn't the article telling us?