Presbycusis, or age-related hearing loss, is the cumulative effect of aging on hearing. Also known as presbyacusis, it's defined as a progressive bilateral symmetrical age-related sensorineural hearing loss. The hearing loss is most marked at higher frequencies. Presentation Deterioration in hearing has been found to start very early, from about age 18 years. The ISO standard 7029 shows expected threshold changes due purely to age for carefully screened populations (for example excluding those… (More on Presbycusis)