My son is whole grade accelerated. He plays sports with his age group, not his grade level. Should he be a superstar athlete when he plays sports through school (i.e., middle & high school), then this is where his athletic ability will be the reason he's on the team.

My brother and I both played sports. As a freshman, I was on the Varsity squads with Juniors & Seniors. As a 10 year old, my brother played on the 12 & under league, not the 10 & under league. So I'm personally not worried about DS6.