What anatomical change occurs as people age that affects the integumentary system?

As people age, one of the most notable changes in the integumentary system is the loss of skin elasticity. This reduction in elasticity occurs due to a decrease in collagen and elastin production, which are proteins that help maintain the skin's firmness and flexibility. Aging also results in a decrease in moisture content, leading to drier skin that is more prone to sagging and the formation of wrinkles. This change affects the skin's overall appearance and function, making it less resilient to environmental factors and more susceptible to injuries and other skin conditions.

While other options mention changes that can occur in a person's body with age, such as hardening of bones or decreased joint flexibility, they are not directly related to the integumentary system. The key focus here is how aging specifically impacts skin properties, making the loss of skin elasticity the most relevant change in this context.