I have very good hearing for my age. One day I was sat at a table with some people and one of them had and app they were using to annoy everyone it sent out a high pitched noise but instead of turning it off they turned it down to the lowest setting and left it on so they could turn it up again but I could still hear it I told him "Hey could you turn that off" and he said "you can hear this?" then everyone was interested and he turned it off and on to test my hearing and he freaked out because they could on hear it at 3 more settings higher compared to me, anyway just thought I'd share that.