The Teenager Audio Test - Can you hear this sound?

Clicking the play button below 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.

This actually hurt my ears and I'm well into my 30's.