While the human auditory range is often cited as 20 Hz to 20 kHz, most adults can't hear frequencies that high. Our ability to perceive high frequencies diminishes with age, a condition known as presbycusis. By our 20s, many of us have already lost sensitivity to frequencies above 15-16 kHz. However, even if we can't hear these highest frequencies in isolation, they may still contribute to our overall perception of sound in music.