I did a hearing test last night and found I could hear just after/as 17kHz was announced.
I'm 37 so I wasn't sure if this is low for my age. I was a bit depressed I couldn't hear
up to at least 18kHz but on Wikipedia it said most adults can't hear above 16kHz, so
perhaps it's not so bad.
I was in a band for 6 years with really silly noise
levels once or twice a week, and often sudden feedback shreaks, etc. Before then I could
just about hear those teenage repeller sirens in my late 20s. That said, my environment is
otherwise unusually quiet.