In what we've heard so far as you get older you learn more moves and acquire more skills. I don't think age will affect you in a negative way at all. You'll start as a generic monk-like character and you'll build him to be your ultimate fighter.You will be able to master other fighters moves and add them to your fighters move list. Supposedly you can learn secret new moves also. The only thing I have heard about age is that it will make your personal character look unique somehow. All-in-all it sounds really cool and exciting...I can't wait!!
Welcome to MKOnline by the way