Take it from a guy that is recently 35 and deaf. Do not screw around about protecting your hearing, and vision. Heredity has a lot to do with the amount of hearing loss that I suffer from. Though I admit my part with loud music, guns, race cars, air planes, and working in an idustrial setting without hearing protection.
Try having people look at you like you are not quite right because you keep asking them to repeat themselves because you could not make out what they were saying. Not to mention how hard it is to speak with children, and women with high pitched voices. Oh and if someone has a thick foreign accent I can not make heads or tails out of what they say. It makes life hard when you can not hear.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.