Look at your ears Age

have a test:

7000 Hz-Prove that you are not deaf, because anyone can hear this frequency.

13000 Hz-Indicates that your ears are younger than 50 years old.

14000 Hz-Indicates that your ears are younger than 40 years old.

15000 Hz-Indicates that your ears are younger than 30 years.

16000 Hz-indicating that your ears are younger than 25 years.

...


If you can insist on hearing 20,000 Hz sound, then congratulations, you are definitely the best choice.

0-30000 Hz, choose a frequency arbitrarily, come with your friends younger than anyone else's ear!

Come and try it out!