One of the main channels on YouTube have published video to determine a person's age by testing the acuity of hearing. The test appeared not so simply, it was created by scientists involved in the development of the educational channel
With age, the ability of the human ear to distinguish between high frequency gradually decreases. Than the frequency range, perceived by the ear, the older man, experts say. This provision became the basis for the developed test.
The audio track contains a frequency spectrum between 8 thousand Hertz and above. With a certain point one ceases to hear the sound. This indicator determines the age of the subject.
While scientists guarantee accurate determination of age for people aged 20-50 years.