I've certainly damaged my hearing over time.

http://journal.plasticmind.com/ears/mosquito-tone-or-how-to-tell-youre-a...

This is an interesting test to see where you are. When my father's alarm clock on his watch goes off, he can't hear it. My mother and I think it's quite funny...

I peak off at about 17KHZ... I must be getting old. EH??? Time for a miracle ear.