FWIW I suffer with degenerative hearing loss which can only be put down to excessive music volume in my younger years. I worked in hotels for 8 years, (discos, jukeboxes etc most nights). I also never went anywhere without my walkman, FFS I even used to to go bed with it on. I used to spend a fortune on AA batteries, (thank you auto reverse!).
Anyhoo, mine was 'officially' picked up when I started my present job as we have an annual hearing test due to the use of power tools in the workshop. In the 10 years I've worked there it initially gradually worsened, although now my age has caught up a bit so it's not regarding as quite as bad now, but it'll never recover, once it's gone it's gone, that's it!
The problem I have mainly is filtering noise. I can forget having a conversation in a loud environment, (pub/party etc), and I struggle sometimes to pick up what my Daughter says because of the higher pitch of her voice, and I'm forever having to get things repeated.
I still attend the occasional concert, but I ALWAYS wear ear plugs these days. They don't take anything away from a concert experience IMO, yet they could prevent you from loss of hearing in the future, no brainer? I should say so.
BTW, I'm 39 years old! So any of you young 'uns reading this, heed the advice and protect your ears, after all you only get one pair.