Wasn't Brown 19 at the begining of the last AHL season?
I'm reading that it goes by which year you were born in and doesn't matter when in the year you were born. So, because Brown was born in 1984, he was considered to be "20" for the 04-05 season, even though he was 19 until November. Anyways, though, PSP has a great point. Kopitar is only 18, so that right there might disqualify him.