This doesn’t directly answer your question. At 63 I’m certain that my hearing isn’t as good as it once was, but I’m also fairly certain that I’m better at recognizing problems areas within a system. I’m a more experience and more patient listener than I once was too. Hearing is a sense, but listening is a skill, and it can be honed with practice and experience. Even if I can’t hear above 10K, the vast majority of music occurs within a range that I can hear.
While I’ve done nothing to my system intentionally to make up for any hearing loss, I have gone after several minor knit picks over the years by trusting my ears, and now have what I feel is better sound across the board.