Which of the following is an impact of aging on physical health?

Worsening eyesight is a significant impact of aging on physical health, commonly observed in the elderly population. As people age, changes in the eye structure occur, including decreased elasticity of the lens, which can lead to presbyopia (difficulty focusing on close objects). Additionally, the risk of developing age-related eye conditions, such as cataracts, glaucoma, and macular degeneration, increases. These changes can affect overall vision quality and may lead to difficulties in daily activities, such as reading or driving, ultimately impacting the individual's quality of life.

The other options do not reflect typical age-related changes. For example, strength generally declines with age due to muscle mass loss. Memory can also decline, especially with aging conditions like dementia, and hair loss typically increases as people get older due to various factors, including hormonal changes and genetics. Therefore, worsening eyesight accurately captures a common physical health impact of the aging process.