If you think your ears are able to detect every sound at any age, think again.
According to a social media challenge, not everyone can hear the same sound once you reach over 25 years of age.
This trend involves listening to a headache-inducing high pitched sound and waiting until you can no longer hear the frequency, and - spoiler alert - not everyone can last until the very end.
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Listen for yourself to find out:
How far into the video did you get until the sound stopped?
According to this theory, only those who are around 25 or under are able to hear the high-pitched noise in the clip all the way through. Dubbed the 'mosquito tone', it is a frequency of 17.4kHz and boy, do we feel it.
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But don't feel too bad if you can't hear because for those who can it can be a pretty awful time.
For example, 32-year-old Maylinn Storbakken, and her 17-year-old niece Carmen Elisabeth Bakklund were initially keen to test out the theory.
In the video, a voice says: "Only people under the age of 25 can hear this sound. Listen."
It then plays the high-pitched mosquito tone which provided Carmen with discomfort while Maylinn didn't seem to hear it at all. Although it's not a proven theory, almost everyone under the age of 20 will be able to hear it quite clearly according to responses to the trend.
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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 hosts Eamonn Holmes and Ruth Langsford about living with the condition, which is called misophonia.
Misophonia is a condition which causes those who suffer to have a strong response to certain sounds - which in Karen's case is breathing.
Speaking to the hosts she explained that 'it's the noise of people breathing'.
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She continued: "When I hear it, the more angry I get. The louder I hear it, the angrier I get."
Eamonn rightfully pointed out that 'they can't stop because they need to breathe!' To which Karen admitted: "And that's the problem."
The situation is so bad for Karen that she has even asked if there's any way doctors can make her deaf, admitting that, "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."
Britt Jones