I'm taking my 10 year old (11 in october) on the youth hunt this year. We were at the range yesterday, and he was accurate enough out to about 100 yards (6 in group). In KS they don't allow the course to be taken for credit until they are 11, and they don't offer any in our area past september. So, he will be taking it next fall.
Interestingly enough, there is no minimum on when you can hunt as long as you are supervised by a licensed adult hunter. No license required for the kid, just a $17 over the counter youth tag.