Adult Hearing Range

Human being can hear from 20Hz to 20,000Hz of audible frequency sounds. However, most adults lose their sensitivity to sounds of 15000+Hz range. This article mentions about an interesting use of this fact to keep children and young people away from certain places.

http://www.nytimes.com/2006/06/12/technology/12ring.html?_r=1&oref=slogin

Also, go to the following site to test how much of hearing ability you have lost. I tested on myself and found that cannot hear 16000Hz onwards -

http://www.ochenk.com/entry.php?id=63

So what was your hearing abllity?