The process of skin aging as the years go by and an individual gets older is known as intrinsic aging, which is determined by internal physiological factors and genes. This chronological aging is not preventable. However, extrinsic aging is caused by external sources, such as climate, pollution, diet, and stress. These factors are largely controllable. The greatest culprit of extrinsic aging is photo-damage or the exposure to ultraviolet light from the sun. Chronic sun exposure is responsible for most of the visible aging on the face, far greater than any other factor. Thus, the common name for extrinsic aging is …Read more »