Grade-wise he mainly gets A's and a B here and there. Honors classes, etc.
While I don't attribute the age he started completely to this, I do think it had a rather positive impact (currently in 8th).
Conversely, I think I started kindergarten at either 4 or 5 and struggled/hated school my entire life. Even had to put up with Evil Nuns. #jake #elwood Food for thought.