Age factor, environmental factors, life factors may be the cause of skin aging. 1. Age factor: with the increase of age, collagen loss, skin aging phenomenon will occur, is an inevitable factor. 2. Environmental factors: long-term exposure to sunlight, the skin is too much exposure to ultraviolet rays, or often subjected to wind and rain and other natural climatic influences, will also aggravate skin aging. 3. Life factors: if long-term mental stress, psychological bitterness and depression, lack of sleep, may lead to skin aging. The causes of skin aging are many, in addition to the above reasons, diseases may also lead to skin aging, if accompanied by physical symptoms, it is recommended to go to the hospital in a timely manner.