Normal healthy skin has a nice epidermis with a smooth outer layer that acts as a good barrier to water and environmental damage. Skin color and tone is even and unblemished. Components such as collagen (which provides skin firmness), elastin (which supplies skin elasticity and rebound) and glycosaminoglycans or GAGs (which keep the skin hydrated) are all abundant.
The two types of skin aging
Internal Aging is the normal aging process that takes place ...