The square finger, moving here and there, lighted suddenly on Bitzer, perhaps because he chanced to sit in the same ray of sunlight which, darting in at one of the bare windows of the intensely white-washed room, irradiated Sissy.
About 90% of the skin's thickness is from the dermal layer of the skin, and much of the variation in skin thickness there is due to variations in collagen and elastin levels.ollagen and elastin break down with age. A gradual decrease in subcutaneous fat in the hypodermal layer of the skin also occurs with age, further decreasing skin thickness. Variations in thickness of these layers have the most dramatic effect on skin appearance.
The dermis gives skin the majority of its thickness. The dermis contains fibers of collagen and elastin, which deplete as a person ages. A diagram of younger skin and older skin showing the different layers. Most anti-aging creams are too dense to penetrate to the demis. The dermis is below the epidermis, or the top layer of skin.