If you are under 18 and using paypal, if you don't EVER apply for any credit checks, they'll never see your age. I accidentally applied for the paypal card, and my 3 year account was shut down. But I made a new one, same SSN just a different checking account linked to it, and it's all working. I ever was able to receive the "PayPal Here" card reader, and my age never came up!
FYI: I'm 16