The age at which age spots begin to grow is not clearly defined and cannot be generalized. Generally, age spots may appear after 40 years of age. If the body has certain chronic diseases, they may appear at an earlier age; if the body is in good health and has no chronic diseases, they may appear at a later age. Age spots may be related to skin aging, hereditary factors and external factors such as sunlight exposure and chemical stimulation. It is possible to appear around the age of 40 If the body itself has diabetes or certain skin diseases, it may appear earlier, for example, at the age of 40; if the body usually has normal physiological functions in all aspects, no chronic diseases, short exposure to sunlight, etc., it may appear later, for example, after the age of 65~70. If there is no uncomfortable symptom of age spots, generally no special treatment is needed. If it affects aesthetics, laser, photodynamic and other therapeutic measures can be taken.