In reply to:

By the way, as you get older, you do lose extreme high-frequency hearing but the good news is that it doesn't matter--there's little musical content of importance between 12 kHz and 20 kHz.


Well, those World's Meastro conductors often fully bloom to his peak at the age of 70's and 80's. They probably cannot hear much in the top octave of "audio" frequencies, but they do know and tell how his orchestra and its instruments should sound!

Cheers!