[BenjiWiebe]

I'm 20 but I can still hear 20 khz, albeit not very well.

[isostatic]

I could when I was 20, did a proper hearing test when I joined my company. 15.625khz was very noticeable - I scoffed at the old timers who couldn't hear it.

I can no longer hear it. Still I can hear 1khz, so that's what's important.