Final answer:
Hearing acuity declines beginning in middle age.
Step-by-step explanation:
The most true statement about aging changes is that hearing acuity declines beginning in middle age. As mentioned in the provided information, the senses decline significantly in late adulthood, including hearing. This decline in hearing acuity begins in middle age and continues into old age. It is important to note that there is great individual variation in the ages at which these changes occur.