The underlying network of elastin and collagen fibers, which provides scaffolding for the surface layers, loosens and unravels. Skin loses its elasticity. When pressed, it no longer springs back to its initial position but instead sags and forms furrows. The skin's ability to retain moisture then diminishes and it becomes dry and scaly. Habitual facial expressions also form characteristic lines.
Gravity exacerbates the situation, contributing to the formation of jowls and drooping eyelids.
In addition, the ability of the skin to repair itself diminishes with age, so wounds are slower to heal. Initial Damaging Effects of Sunlight. Both UVA and UVB rays cause damage leading to wrinkles, lower immunity against infection, aging skin disorders, and cancer. They appear to damage cells in different ways, however. UVB radiation is the primary cause of sunburn.