How does the subcutaneous layer change as a person ages?

As a person ages, the subcutaneous layer, which is the deepest layer of the skin consisting of fat and connective tissues, typically decreases in size and thins out. This reduction in the subcutaneous fat layer contributes to various changes in the skin's appearance and texture. For example, as this layer becomes thinner, individuals may notice a loss of volume, leading to sagging skin and the prominence of underlying structures such as bones and veins. This thinning is further associated with a decreased ability to retain moisture and heat, which can affect overall skin health and resilience.

While the other options describe changes that do not accurately reflect the typical aging process of the subcutaneous layer, recognizing that it decreases emphasizes how aging impacts skin structure, leading to more visible signs of aging such as wrinkles and a less plump appearance.