Presbycusis which means "old hearing" is when a person can not hear things at higher frequencies and usually comes with aging. Presbycusis is said to affect males more severely then females. Other causes or reasons why presbycusis can occur is through heredity, diabetes, smoking, and noise trauma. Recently, the ability of young people to hear high frequency tones that are inaudible to others over 25 or so has led to the development of technologies to stop younger people from loitering near British shops. This piece of technology is called "The Mosquito". Hear is a clip on "The Mosquito"
http://www.youtube.com/watch?v=4PjLRJxPLyU
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