As I approach the fabled three score and ten, I am losing my high frequency hearing. Fortunately it doesn't seem to affect my enjoyment of music. It reminds me of studying hearing frequency response in school, some 50-60 years ago. I was also learning piano and I figured out that the lowest A on the keyboard was slightly below 30 Hz and highest C was slightly above 4000 Hz (cycles per second at that time). I asked my piano teacher whether he had any students who couldn't hear the lowest notes on the piano, since I had read that the human ear hears between 30 and 15,000 Hz. He said that, no, he never had a student who couldn't hear the lowest note, but he had several older male students over the years who couldn't hear the top notes on the piano. So if you can hear 4000 Hz, then you can hear all the notes on the piano. It also gives you a sense of how high 4000 Hz is and that everything above that are overtones. There are a few instruments whose fundamentals go higher, but not by much.
Larry