If you buy it for him prior to him turning 10, then you can continue using the pass. You can have it upgraded to an adult pass at no additional cost. We had that happen with our AP's this past year. Bought them and started using them prior to dd's 10th bday, but when she turned 10 we had it "upgraded" to an adult AP and they didn't charge us anything differently. Of course now I have to buy her an adult AP <sigh>