Yes, if you're over the age of 13, go to the settings tab and you'll see the birthdate option. You may change it from there, however, if you're under 13, I don't think it'll be possible. You may try looking at YT for answers.
GOOD TRADES ONLY, SEND GOOD 1v1's OR NICE DOWNGRADES, LOW DEMMAND MUST OP A GOOD AMOUNT, REPLY IF YOU SENT A TRADE AND I'LL TELL YOU IF I ACCEPTED OR DECLINED AND THE REASON. IT HAS A 7.1K RAP AND 7K VALUE!!!!!!