Shooting for many years without hearing protection coupled with cranked up Led Zep thru headphones probably didn't do my hearing any good. As a student pilot in my twenties, getting my class III medical, I had people covering their ears while the audiologist cranked up the high freq part of the test. They could hear it outside of the headphones I was wearing. Rats were vacating the premises, I couldn't hear squat. Was told I could never be a commercial pilot. I don't have much ringing, thankfully, but I'm oblivious to most high freq sound. One day probably burn the house down making tea. Teakettle whistling.....nada. As has been stated here, protect your hearing, I wish I had.