Your face can be kept smooth and supple with the help of elastin fibers and collagen in your skin. Those fibers begin to breakdown as you grow older, this can lead to sagging face. The thinning of the outer layer of the skin or the epidermis can cause the skin to sag. The layer of fat which kept your skin looking youthful and plump is lost as your skin thins. Age is the cause of facial skin sagging because as you age, your sebaceous glands produce less oil making your skin drier and more prone to wrinkles. By treating your skin right, you will minimize the damage and keep your face looking firm.