There are many reasons for skin aging, mainly including age, environment, spirit and living habits and other factors. 1. Age factor: with age, the skin will gradually aging, is a normal physiological phenomenon. 2. Environmental factors: skin photo-aging is the main factor of skin aging, ordinary life do not pay attention to sunscreen, moisturizing will aggravate the process of photo-aging, or their own work will be in contact with chemicals and other factors, may be triggered by the aging of the skin. 3. Mental factors: depression, worry and anxiety, as well as mental tension, stress and other mental factors, may trigger skin aging. 4. Lifestyle habits: long-term late night, irregular life or smoking, alcoholism, picky eating and other factors, may trigger poor skin condition, easy to accelerate skin aging. The causes of skin aging are more, it is recommended to go to a regular hospital to consult a doctor to understand the relevant matters.