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Hearing Loss
Hearing impairment is when a person is unable to partially or completely hear sound in one or both ears. Hearing impairment is a common part of aging.
Source: healthline.com
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 ... The Sound Adult's Can't Hear (1 hr) ... i tried it on my teacher and she didnt hear it ... my dad cant hear it so my teacher might not be able to .

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

Apparently, there's a noise that only people under 25 can hear. Can you hear it?

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.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 ...

tech.thefuntimesguide.com/mosquitone

Mosquito Ringtone: Parents & Teachers Can't Hear It, But Teens Can ... Since adults lose the ability to hear high-pitched sounds, the teens are using this ...

mentalfloss.com/article/64572/5-sounds-you-probably-cant-hear

Jun 2, 2015 ... Think you have perfect hearing? There are still plenty of sounds in the world that you can't detect. The low range of human hearing starts ...