Two of my choir members lost the ability to match pitch, even though they both wore hearing aids and could understand speech. It's something both had trouble accepting; the one still alive in his 90s tries, sings to me over the phone. Both touching and sad. The other, since passed, had to be convinced by her audiologist that things were bad and would never improve.
Dementia, fortunately, is not in the picture.
My tinnitus isn't very bad, but my left ear seems to be fading a bit. Time for a checkup.
Tom