How and why people having their hearing diminish is a fairly complex problem that honestly can't be ruled down to one single thing causing it for everyone.that would be dreadful... some of my favorite moments are listening to flac files on my hifi stereo...
i guess im glad i never had more then 1000w pushing my sub...
i do have a high pitched ring in my ears all the time... like that noise you hear when turning on an old crusty tube tv. i just figure it means i myself is still "on".
Some people are around excessive noise levels for years and never lose their hearing sensitivity and range yet others can lose theirs without ever having been exposed to anything that would be considered damagingly loud.
I for one was one of those kids with the outrageous sound system that I played loud constantly when driving. After that I spent countless hours running farm machinery without hearing protection. On top of that I also do and have done regular metal work all of my adult life which at times when doing shaping and grinding work or plasma cutting and torch work can produce deafening sound levels.
Last hearing test I had I was still above average for my age in both sensitivity and range. I'm 39 now and I can still hear a pin drop on a tile floor at 100 feet and have upper range to ~17KHz!