Abstract: Skin aging is a very complicated process with many factors involved, which will lead to changes in skin elasticity and functions. Skin aging can be triggered by both intrinsic (e.g., age) and extrinsic (e.g., ultraviolet light) factors. The latter is also called skin photoaging. This paper reviewed the mechanisms of photoaging and related prevention approaches based on international literature. It also described the major signaling pathways involved in the process of photoaging so as to inform further studies.