Hearing damage is sneaky. Typically it is a progressive change over many years, and you have no point of reference - what you hear is what is there, right? So once you become aware, the damage is often fairly pronounced, and it will only get worse with time.thanks for sharing, I tried the tests... My tranquil and calm life in these forgotten mountains seem to pay off in a way, my hearing is still okay. I got an above average score on the combinations of numbers test with background noise. After 15KHz I hear nothing though.
I feel for deejays.... 4 years ago I went to a nightclub in the city where the disc jockey had been working for years and he looked like he was in his 50s. The level of treble he applied to the sound could destroy your ears, and the guy was so calm playing the music.
I was there for a while, I did bear with it but it got to a point where I asked my girlfriend if we could leave and listen to music in a different place because I had to cap my own ears with my fingers, when I didn't oh my the shrieking sound... It was a pity 'cos my gf cousins where there and we were having fun, but even they complained
It used to be that military and musicians, along with certain heavy industry workers were the worst off, but headphone listening has been a great equaliser in terms of hearing damage. Now everyone can have it. As long as you can hear conversation you are socially OK though, which is what's most important. As Shifty pointed out, nobody out of kindergarten can hear the highest frequencies, but sensitivity can still be really good. Once sensitivity vs. frequency vs. levels is getting really wonky, your brain start having problems correctly interpreting the input.
Moral - simply avoid too high SPLs, and check your hearing properly if you notice signs that something might be off.
Oh, and STAX ear speakers.