Sounds adults can t hear

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Introduction Ever wonder why some adults experience trouble with hearing as they get older? Hearing loss tends to become more severe as we age. But does hearing loss cause everything to sound uniformly softer or do certain sounds become harder to hear than others? Some security companies recently began manufacturing machines designed to emit an annoying sound that prevents teenagers from loitering outside stores and shops. Things got even more interesting when some kids realized they could turn this technology on their elders by making the sound into a ringtone.
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Sonic Science: The High-Frequency Hearing Test

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Think you have perfect hearing? The low range of human hearing starts around 20 hertz, and tops out at about 20, [ PDF ]. By contrast, bats can hear ultrasonic sounds with frequencies up to , hertz. Other animals, like elephants, hear sounds many times lower than those a human can perceive.
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Most people over 18 can't hear these sounds

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