If you are a parent registering your child for a Junior Team Tennis program and receive the error message that the player is ineligible to register for the team because of the National Age eligibility cutoff date, this means the player does not remain age eligible through the cutoff date. The National Age eligibility cutoff date is 8/31 of the program's Championship Year.

For a 2020 program, the National Age Cutoff Date is 8/31/2020.

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The player in the example is not able to register for this 14's division because they turn 15 years old before the age eligibility cutoff date. This makes them age ineligible. 

The workaround would be to register for a different team or Contact Junior Team Tennis Coordinator who will verify the JTT program settings or help find the player a different team.