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A social media challenge claims only people under the age of 25 can hear a certain high-pitched sound. You can check out the noise for yourself here:
Could you hear it?
Now, you don't need me to tell you that as we get older our hearing and eyesight can deteriorate - much like our ability to enjoy a night out with a three-day hangover.
As a consequence of this, the theory claims, only those who are around 25 or under are able to hear the high-pitched noise in the clip.
The noise is known as a 'mosquito tone' and is 17.4kHz.
But don't feel too bad if you can't hear because for those who can it's a pretty awful noise to be subjected to.
In the video, a voice says: "Only people under the age of 25 can hear this sound. Listen."
It then plays the excruciating - if you're young - sound, with Carmen appearing to be in a fair bit of discomfort while Maylinn seems none the wiser.
Now, it's not a perfect science. There will be many of you out there who are older than 25 and can hear it perfectly, while some younger people won't be able to hear a thing.
However, almost everyone under the age of 20 will be able to hear it quite clearly.
Recently, a woman revealed she has no problem with her hearing getting worse over time and that she's looking to speed the process up.
Karen, from Scotland, called into This Morning and spoke to to hosts Eamonn Holmes and Ruth Langsford about living with the condition, which is called misophonia.
People who suffer from misophonia have a strong response to certain sounds - in Karen's case, breathing.
Speaking on the show she said: "So it's the noise of people breathing. When I hear it, the more angry I get. The louder I hear it, the angrier I get.
"I just need the noise to stop and that's how I feel. I just get so angry."
But as Eamonn quite rightly pointed: "And they can't stop because they need to breathe!"
To which Karen admitted: "And that's the problem."
In fact, the situation is so bad Karen has even asked if there's any way doctors can make her deaf.
She told the hosts: "I did ask the doctor one time if I could get an operation to make me deaf but they wouldn't do it."
When asked if it really was so severe she'd consider something that extreme, Karen added: "It's that bad, yes."
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