There may already be one of these laying around here, but I'll post this anyway.
After 23 years of playing, and so many more listening to music with head phones, I'm amazed that my hearing is as good as it is.
Here is a hearing test. I am good through 15000hz. At 16000, the tone is harder to hear, but I can still detect it. I can even hear up to 22000, but just barely.