The law of having twenty year old skin Due to the impact of UV rays attack, environmental pollution, bad habits, mental stress and many other factors that cause aging, skin aging speed is accelerating, women of any age should be anti-aging, it is the secret to stay young and beautiful. Many problems in skin whitening stem from skin aging. The signs of aging skin include dull skin color, loss of luster, discoloration, sagging skin, lack of elasticity, and wrinkles. Aging is irreversible, but the beauty can be retained, to prevent skin aging, to keep the skin young should follow the following rules: 1, the use of sunscreen products suitable for their skin type. 2, to ensure adequate skin moisture. 3, to maintain the vitality of keratinocytes. 4, to ensure that the skin normal synthesis of dermal collagen fibers, elastic fibers and hyaluronic acid. 5, by neutralizing free radicals to prevent skin oxidation. 20-year-old anti-aging skin care specific practices: 1, effective moisturizing and sun protection. Skin dehydration can cause skin sensitivity and make the skin more susceptible to damage. Drinking water can relieve skin stress, and replenishing enough water every day is conducive to maintaining the balance of skin humidity. 2, maintain good skin care habits. Avoid all kinds of undesirable stimuli, do not change skin care products frequently, do not use unknown skin care products, do not smoke, drink alcohol. 3, choose to contain hyaluronic acid and vitamin A aldehyde skin care products. 4, maintain a normal routine and a good state of mind, pay attention to diet and nutrition, physical exercise from time to time, enjoy enough sleep.