If T is from so called damaged inner ear hair cells then why does the entire population over 45 not have T? Every year a certain number of hair cells diminish as the human gets older and older. If T is truly from damaged hair cells in the high frequency range then my assumption is everyone in there 40's or even late 30's should develop T as high frequency hearing loss/hair cells slowly diminish. The loss of inner/outer ear hair cells just does not make much logical sense. I'm more inclined to T being in the brain and resulting from "shock" or "trauma" whether noise or non-noise trauma relationship.