Well, this is very interesting.
The Teenager Audio Test
will produce a tone that is generally only heard by people under the age of 25. It has been used as a deterrent device to keep teenagers from loitering in malls and shops, and sounds similar to a buzzing mosquito. Typically the longer you listen to it, the more annoying it gets.
There you have it.
And guess what? This old man is considered a teenager too..Woot
Since I can hear the sound... Ho ho ho ho... .
Created by Train Horns
But then again, me think the test is not that authentic cuz ho, among the test subjects I tested on there is this one 50 years old lady who says she can hear the audio.
However, majority old people **ahem** can't hear it. Suppose.