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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%27t+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%27t+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%27t+Hear&v=d2x2Cs27cHk
Sep 12, 2016 ... sah dood dedicated to Mr.Ross.

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.

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

Mar 2, 2015 ... Apparently, there's a noise that only people under 25 can hear. Can you ... Let's see how well you hear and if you hear your age. ... No, I can't ...

www.mnn.com/health/fitness-well-being/stories/most-people-over-18-cant-hear-these-sounds

Jul 24, 2015 ... Hearing loss is real, something that happens even to those who didn't spend large chunks of their 20s in loud bars.

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

May 23, 2013 ... 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 ...

itunes.apple.com/us/app/stealth-tone/id314839075?mt=8

Jul 20, 2010 ... Stealth Tone is a special tool that most 20+ year olds cannot hear! Due to a special frequency, you can play this annoying sound in stealth ...

metro.co.uk/2016/02/27/if-you-cant-hear-this-sound-youre-getting-old-5720888

Feb 27, 2016 ... Those over the age of 25 should not be able to hear what is known as the mosquito tone - a noise above 17.4kHz.