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Presbycusis, or age-related hearing loss, is the cumulative effect of aging on hearing. Hearing loss usually begins gradually after the age of sixty, and is usually found more often in men than women because men usually have greater exposure to environmental noise. Over time, the detection of high-pitched sounds becomes more difficult and both ears tend to be affected. Recently, this condition has led to the development of technologies to stop younger people from loitering near British stores (The Mosquito), and the development of a cell phone ringtone, Teen Buzz, for students to use in school, that many older instructors are unable to hear. In September 2006 this technique was used to make a dance track called 'Buzzin'. The track had two melodies, one that everyone could hear and one that only younger people could hear.
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