Final answer:
Presbycusis is a normal age-related change in hearing. It is a type of hearing loss that occurs gradually over time as a person gets older.
Step-by-step explanation:
Presbycusis is best defined as a normal age-related change in hearing. It is a type of hearing loss that occurs gradually over time as a person gets older. The exact cause of presbycusis is not known, but it is believed to be a result of a combination of factors including genetics, exposure to loud noises, and natural wear and tear of the auditory system.