Although the frequency that people could hear is different depend on individuals, an audible sounds are from 20 Hz to 20 kHz mostly, and the power of hearing high-frequency is getting worser by taking an age. Some stores in England have tried to expel the teens from front of their store by using mosquito sound so that front of the store is not aimed as teen’s meeting place. The mosquito sound is very popular among the young generation as well. Young students even set mosquito sound as their ringtone because their teacher can not hear the mosquito sound. By using the feature as above, the Ear Age checks the frequency a user could hear, and calculates the age of ear. Please use this application to cheer up your banquet or drinking party by playing a mosquito sound or try to test your ears by yourself.