Can my six year old race

As long as he is 4 feet tall and knows the flags & signs they hold up.

Any six year old can race as long as they are 48 inches tall.

Yes 6 years and has to be 48 inches tall for jr race

Yes, they have smaller cars for kids.

Yes. But make shure he knows the flags and precautions. And he cannot just floor it on a sharp turn.