Ninety percent of the cases of premature skin aging are caused by excessive exposure to sunlight. Ultraviolet Light [UVA & UVB] damages collagen and over time damage from sun will cause wrinkles to develop. In addition, overuse of facial muscles cause skin lines and folds to deepen especially in the areas of the frown, the forehead and around the eyes.
This is more so for light and fair skin because the skin is thinner and has less melanin. How do you face having fair skin? Read this article: Learn To Face Your Fair Skin.