Age Matrix's, soccer + school
But I think I've figured it out.
For school, usually the rule is something like you have turn 5 by 9/1 to start kindergarten. So kids that are born in Sep/Oct/Nov will be the older kids in the class. The kids born June/July/Aug will be the young ones.
But in soccer it goes by birth year.
So combine the two and it means something like...
Kids born...
Age Matrix's, soccer + school