No, it would go by birthdays not but graduation year still. Only thing that would change would be calendar year dates versus school year dates.Wouldn't she be playing on a 2028 ECNL club team if the rule change happened? She's a 2028 in high school right now. I thought teams would be formed based on what high school graduation year you are?
This was exactly how it was in 2015/16 when I an AYSO Commisioner right before the birth year change happened.
So any player who is September 2010 but graduating 2028 would be be playing U15 instead of U16 when this rule takes affect. They do not look at class of 2028 or class of 2029 specifically. We assume kids who are in that birth range would be graduating those years just as we assume kids born in birth year are graduating certain class years