The term “presbycusis” refers to the slow and progressive loss of hearing that affects both ears to the same degree, usually starting around the age of 50. This age-related loss of hearing most often starts in the high-frequency range, where conversation is conducted The term “presbycusis” refers to the slow and progressive loss of hearing that affects both ears to the same degree, usually starting around the age of 50. This age-related loss of hearing most often starts in the high-frequency range, where conversation is conducted