Skin changes are among the most visible signs of aging. Evidence of increasing age includes wrinkles and sagging skin. Whitening or graying of the hair is another obvious sign of aging.
Your skin does many things. It:
Contains nerve receptors that allow you to feel touch, pain, and pressure
Helps control fluid and electrolyte balance
Helps control your body temperature
Protects you from the environment
Although skin has many layers, it can generally be divided into three main parts:
The outer part (epidermis) contains skin cells, pigment, and proteins.
The middle part (dermis) contains blood vessels, nerves, hair follicles, and oil glands. The dermis provides nutrients to the epidermis.
The inner layer under the dermis (the subcutaneous layer) contains sweat glands, some hair follicles, blood vessels, and fat.
Each layer also contains connective tissue with collagen fibers to give support and elastin fibers to provide flexibility and strength.