When I was 20 I could hear the "ultrasonic" motion detector at the museum. It played 24/7 because it was "not audible". It was deafening.
No, I am not a girl and am not a dog. Instead I am a dirty old man.
I can still hear some CRT TVs whistling at 15.7kHz.
I could hear that the new speakers at the concert hall and stadium sounded bad.
I could hear huge differences between different tweeters.
I have never had my hearing tested because they don't test higher than only 8kHz.