Final answer:
Wrinkles and sagging skin result from the loss of the skin's elasticity and structure due to aging. The dermis becomes less able to regenerate, leading to slower wound healing. Decreased collagen and elastin production, weakened muscles, and reduced moisture retention contribute to the breakdown of the skin's structure.
Step-by-step explanation:
Wrinkles around the eyes and jawline, as well as sagging skin, are the result of the loss of the skin's elasticity and structure with age. The dermis, which is responsible for the elasticity and resilience of the skin, exhibits a reduced ability to regenerate, leading to slower wound healing. Decreased collagen and elastin production in the dermis, weakening of muscles underneath the skin, and the skin's inability to retain adequate moisture all contribute to the breakdown of its structure and the appearance of wrinkles and sagging.