Central auditory processing disorders occur when actual hearing ability is unaffected, but the part of the brain that controls processing has suffered damage. Changes in the corpus callosum, the connection between the right and left sides of the brain, play a factor in the decline of auditory processing.
Age and gender are related to auditory processing. Although both sexes showed waning sound processing at ages 40 to 55, men had gradual declines starting in their late 30s, while women worsened abruptly around age 55, after menopause. But neither sex continued on the auditory downward spiral into their 60s and 70s, indicating the decline in sound processing stabilizes at some point.