Hi Scott. IMO 18 isn't too old to be a successful boxer, but first you just need to see how good you are. So for the start just fight. Then think of success and turning pro. As for headgear, it protects you to some extent, but damage can still be done. But it's boxing. You can be hurt. As for your brain, the chances are there may be some effect, but how much varies on how much you box and your style (whether you're a slugger or boxer). It may affect you. It may not. It's all in the future though. Just enjoy boxing mate :thumbsup: