Skin tone actually plays a role in how old—or young—you look. How do we know that? Scientists Karl Grammer and Bernhard Fink used digital photos of real women to create 3D images of faces with a variety of skin tone patterns. Grammer and Fink removed all other age-defining features such as facial furrows, lines and wrinkles. Then, over 400 subjects were asked to view the faces, guess the age, and rate them for how healthy they looked and how attractive they appeared. The faces with the most even skin tone, or most uniform color distribution, were not only judged to be younger but they also received significantly higher ratings for attractiveness and looking healthy. So if younger-looking skin is on your mind, skin tone should be too.