A hearing aid has three basic parts: a microphone, amplifier, and speaker. The hearing aid receives sound through a microphone, which converts the sound waves to electrical signals and sends them to an amplifier. The amplifier increases the power of the signals and then sends them to the ear through a speaker.
A hearing age test measures a person's ability to hear sounds across a spectrum of frequencies and soundwaves, ranging from high to low. Such tests estimate your true hearing age based on the highest sound frequency the ear can detect.
