Perhaps lowering your tone a little would help me get the question.
I noticed tinnitus and hi frequency deafness starting after a hectic year training folk on turbo-props. I have always thought it to be too much of a coincidence to discount.
The white noise on jet transport aircraft seems to goes up exponentially above about +M.70 . I don't know of any relationship between the frequency of the ‘irritant noise' and the frequency band that it affects in the ear, though it does seem intuitively logical. The main problem seems to stem from the sheer power of the noise.
I wonder if years of wearing head-sets causes unhealthy sweating and resultant low level infections that take their toll.