Hearing Loss
Hearing impairment (Shephard, 1997): -1.6% young adults -12-30% retirement age -50% adults over 80
Physiological losses (Shephard, 1997) -Damage to auditory nerve -Deterioration of auditory cortex -Stiffening of basilar membrane
Increased variability of mean values for hearing measurement as age increases (Morse, 1999)