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The normal human hearing range is between about 12 and 20 kHz, but beginning around age 8 this range begins to shrink, and adults can no longer hear sounds above a certain frequency level.
www.ask.com/youtube?q=Sound Adults Can't Hear&v=RG0O478CQ-E
Oct 5, 2008 ... This is a high-pitched sound that people over the age of 25 shouldn't hear. The sound seems to work better in a higher quality.
www.ask.com/youtube?q=Sound Adults Can't Hear&v=VoFGKwZxT_o
Nov 21, 2009 ... This is the sound adults over 30 cannot hear.(some may not qualify)Enjoy!plz comment,rate and subscribe!
www.ask.com/youtube?q=Sound Adults Can't Hear&v=Tcs4QJWO7QY
Apr 12, 2014 ... Sadly as you get older your ears do to, so test your ears and see if you can still make out this high pitched noise. Teens, check if your parents ...

Can You Hear This Sound That Only Young People Can Hear

www.buzzfeed.com/daves4/how-young-are-your-ears

Mar 2, 2015 ... Apparently, there's a noise that only people under 25 can hear. ... As you get older, the hearing process (sound waves travel into your ear, hit your eardrum, and vibrate three tiny bones, ... No, I can't ... PHOTO: Adult Swim.

Try It: Can You Hear These Sounds Only Young People Hear?

www.yahoo.com/health/try-it-can-you-hear-these-sounds-only-young-112627654778.html

Mar 3, 2015 ... On the flip side, teens are striking back by employing these pitches as ringtones, so they can get calls that their parents and teachers can't hear.

The Teenager Audio Test - Can you hear this sound? - The Oatmeal

theoatmeal.com/quizzes/sound/

... and sounds similar to a buzzing mosquito. The elderly and people with hearing damage often cannot hear the sound. Can you hear this sound? Click to play.

Sonic Science: The High-Frequency Hearing Test - Scientific American

www.scientificamerican.com/article/bring-science-home-high-frequency-hearing/

Teens are effectively driven away, but many adults can't hear this sound at all! Things got even more interesting when some kids realized they could turn this ...

[FLASH] The sounds that adult can't hear (a.k.a Mosquito Sound)

itsd210.s24.xrea.com/en/mosquito_sound/

These contain high-pitched sounds that Teenager Repellent "Mosquito" emits. Will cause discomfort in certain people. In spite whether you can or can't hear, ...

Ultrasonic Ringtones - the new ringtones that only kids can hear!

www.ultrasonic-ringtones.com/

This means that they can only be heard by kids and generally can't be heard by adults over the age over 20 or so. See this article at the BBC to find out more.

Popular Q&A
Q: Is there a sound adults can not hear.?
A: supposedly yes. there is sound of a high enough frequency that most people over 21 years old cannot hear it, since their ears have taken so much. its used in al... Read More »
Source: answers.yahoo.com
Q: Annoying sounds adults can't hear?
A: this sounds perfect for you http://www.msnbc.msn.com/id/13274669/ basically, a ringtone that adults can't really hear becuase its so high pitched, and they're t... Read More »
Source: answers.yahoo.com
Q: Does T-Mobile t-zones have any mosquito sounds adults can't hear?
A: No, Sorry that is just a myth. Read More »
Source: www.chacha.com
Q: What is the high pitch sound that adults can't hear is called?
A: It is a high pitch frequency, in ring tone form it is called the Read More »
Source: www.chacha.com
Q: What is the highest frequency sound wave an adult can hear.
A: An adult can hear up to 10 kHz, but it depends always on the level this frequency has. The sensitivity of hearing goes slowly down with age. If there is no leve... Read More »
Source: www.answers.com