I had previously never heard of the "teen buzz" phenomenon. After reading more about it online, I used one of the principles of scientific thinking and checked its replicability. It just so happened that my family was having a celebration of February birthdays at my house this weekend so I decided to use all of my relatives as my subjects. I grouped my family into two groups. There were 11 subjects in the over 40 group and 13 subjects in the under 40 group. My hypothesis was that almost all of the over 40 subjects would not be able to hear the noise. After the presents where opened I told everyone about my hypothesis. I wanted to see if it was true that older people could not hear the "mosquito noise". I had everyone be quiet and started to play the noise and recorded my data.
Different Frequencies: http://www.freemosquitoringtones.org/hearing_test/
My hypothesis was correct, everyone in the over 40 group could not hear the noise except for my uncle Tim. He is just a special person that can hear the higher frequencies. This must be to the fact that he works outside all day so he doesn't have to listen to the humming of computers and such.