Anyone born after 9/1/2004 can play. It does not matter what grade they are in, or even if they go to school. Its like any other age based sport. Other than this, the other qualifications are tied to residence (must reside within a certain distance of club's home field) and participation (must play in a minimum amount of tournaments).
In NY, anyone born from 9/1/2004 to 11/30/2004 would normally be in 8th grade at present, although some of these kids will be in 7th grade because they were not promptly enrolled in K when younger.
