you'll be fine without muffs until you're 30. Then, you'll regret every day you went to the range without muffs or plugs. I'm only 19, and I sometimes swear that I'm going deaf despite doctors saying that my hearing is perfectly fine because of all the electro-industrial and power rock/metal I get blasted into my head from either concerts, clubs, or my iPod, and then all of the countless times I've been hit in the ears and head from scholastic wrestling. Imagine how much worse it'd be if I shot without muffs. I'd be deaf in another 15 years if not sooner. At the rate I'm going, I'll probably be alright until I retire from work if luck permits.
bottom line: you're young, with lots of very loud things nowadays in your life that will damage your hearing one way or another. Don't add onto it with gunfire.
bottom line: you're young, with lots of very loud things nowadays in your life that will damage your hearing one way or another. Don't add onto it with gunfire.