Final answer:
In late adulthood, the most likely physiological change in a 58-year-old client is decreased skin turgor.
Step-by-step explanation:
As people age, they experience various physiological changes. In late adulthood, which typically extends from the 60s onwards, the skin loses elasticity and wrinkles become more prominent. Visual acuity also decreases, and muscle strength diminishes. Additionally, the senses, such as smell, taste, hearing, and vision, decline significantly. Therefore, the most likely physiological change the nurse will find in a 58-year-old client is decreased skin turgor.