What happens to the subcutis layer as you age?

As individuals age, the subcutis layer, which is also known as the hypodermis, tends to decrease in thickness. This layer is primarily composed of fat and connective tissue and plays a crucial role in providing insulation, cushioning, and support to the skin and underlying structures. As we age, factors such as hormonal changes, decreased metabolism, and reduced fat production contribute to the gradual loss of fat in the subcutis. This thinning can lead to changes in skin appearance, including sagging and increased vulnerability to environmental factors, as well as reduced cushioning around bones and joints.

The other options do not accurately represent the changes that occur in the subcutis layer with age. It does not increase or stay the same; rather, it naturally diminishes over time, and while some changes do occur in the texture and functionality of the tissue, it does not typically "harden" in a way that would be considered a normal part of the aging process.