Mar 03, 2015 · 17,400 Hz is the frequency only teenagers can hear! Most people over 18 should not be able to detect this sound. Some major retailers actually use this science to keep teens Author: Laura Kenney. Can You Hear This Sound That Only Young People Can Hear? making certain high frequencies hard or impossible to hear. this sound should be hard to hear no matter what age you are.
Jul 24, 2015 · Most people over 18 can't hear these sounds when you were in your teens and early 20s. when you are listening at low sound levels." So you may not be able to hear that blackboard Author: John Donovan. May 26, 2006 · British shopkeepers tired of teenage loiterers have turned to the Mosquito teen repellent, which emits a high-pitch frequency that most teenagers can hear -- but not most adults. But now teens.