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Which of the following changes in hearing is a normal part of aging?

According to the National Institute on Deafness and Other Communication Disorders, about one in three Americans between the ages of 65 and 74 has hearing loss, with nearly half of those older than 75 experiencing difficulty hearing. This gradual decline, or presbycusis, is a normal part of the aging process and explains **which of the following changes in hearing is a normal part of aging**. It is primarily characterized by the diminished ability to hear high-pitched sounds.