I have no doubt that my hearing has suffered from years of abuse. Concerts, loud nightclubs and blasting headphones in my youth have taken their toll. I'm more careful about it now, but like you said, the damage is done.
I wear earplugs now when I go to shows. It cuts down on the feedback and actually makes the sound better.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.