As we grow older, our skin will gradually lose its youthful appearance and start to show signs of aging. Intrinsic aging and extrinsic aging are terms that are used when discussing the skin’s aging process. The effects of intrinsic aging are caused by internal factors, while the effects of extrinsic aging are caused by external factors. Everyone will experience the effects of aging on their skin as they grow older, but how and when they manifest will depend on internal and external factors. Genetic factors, hormones, and metabolic reactions are responsible for intrinsic aging. Extrinsic aging is a result of external forces, such as ultra-violet radiation from sun exposure, lifestyle choices (e.g. alcohol or nicotine consumption), and air pollution.