Unsound, I do believe we hear things differently as our hearing diminishes. The balance of the sound would almost have to change some but, with our ears and brain being more sensitive to the midrange frequencies, it may not affect our hearing as much as we might think. The brain has an amazing ability to compensate for that sort of thing.
On a related note, I have often wondered if much of us older folks' appreciation for LPs is due to the fact that we can no longer hear as many of the crackles and pops that used to irritate us in our younger days.