It's such a ridiculous conversation. If one 6th grader is 12 .another 6th grader is a real smart kid and he was pushed ahead and is 10. You don't see how those 2 kids playing youth sports against each other is unfair. Most normal people would see that. I wouldn't want my 12 year old dominating 10 year olds and I wouldn't want my 10 year old getting beat up by 12 year olds. There really isn't much else to say. Kids being the same age is the way to go, it's called fair competition.