'As we grow older, we can lose the ability to hear both the lowest and the highest frequencies. The most drastic losses come, first and most often, on the high end of things.
Many teenagers can hear very close to what is considered the 20 kilohertz high-end threshold. Many people under 25 can hear up to the 14 kilohertz or 15 kilohertz tones. As you get older, though, it all starts sliding downhill.
So if you've crossed 25 and you can't hear that 17 kilohertz mosquito-y sound? No need to curl up just yet. "I think it's really natural," says audiologist Anne Oyler, the associate director for Audiology Professional Practices for the American Speech-Language-Hearing Association (ASHA). "I don't think it's cause for concern."' - via MNN
Are you curious about your hearing?