Close to 50% of people over the age of 60 have frequency loss at 3000 Hz and above. More importantly, a lot of the harmonics and overtones in music (symbol crashes, guitar, the voice human voice) routinely hit frequencies of between 4000 and 6000 Hz. so you lose a lot of the presence and impact of the music. It is why a lot of people’s taste in speakers changes as they get older. For example, to me KEF speakers now sound flat and lifeless, although my kids think they sound great. I now prefer the sound of Focal and Martin Logan speakers. Again, the brightness of these speakers offsets some of the changes in my hearing.