Yep that's definitely true, but on average 17kHz is the cut off for 19-20. I know first hand that there are uncommon people, like me. Through an accident with

Yep that's definitely true, but on average 17kHz is the cut off for 19-20. I know first hand that there are uncommon people, like me. Through an accident with way too many fireworks, or not enough fireworks depending on how you look at the situation, I hear a random high C noise when it's completely quiet. My hearing in my right ear cuts out at around 15kHz. But on average. anything under 17kHz is audible to the average teen-young adult.