This is going to become a more prevalent problem.
As more and more teens listen to more and more I-pods, and drive more and more cars with stereos you can hear plainly through the closed windows, I predict that we are raising a generation of seriously hearing-impaired adults.
It seems that many "musicians" currently are confusing volume with quality in their output, and the kids don't know any better than to go along with it.
The upside of this widespread problem is, that maybe someone, as they age, in desperation, will come up with a cure for tinnitis. That, or sign language will become a lot more common.
As I understand it, there is no repairing damaged hearing at present. The important thing (as has been pointed out several times above) is to preserve what hearing you have left.
My tinnitis is constant, low-level; never prevents me from hearing anything else. Thank God.
Caused by shooting a few times with no protection, once cutting an aluminum screen door to size on a table saw (God what a racket!!), and--worst--reffing soccer. Guess who gets the most "benefit" from the ref's Acme Thunderer! I'd ref 3-4 games of a Saturday, and my ears would ring loudly until about Wednesday. Did that for about 5 summers.