Couples tend to look more alike the longer they are together. Studies have been done to analyze the appearance of couples from pictures of them as newlyweds to them decades later, and the results were pretty conclusive that the couples looked more and more alike as the years went on. Also, the happier the couples said they were, the more they tended to look alike. One of the reasons suggested for this is that people in close contact often start to mimic the other’s facial expressions and reactions. So if your partner is a joking and laughing kind of person, then they’ll most likely develop laugh lines around their mouth, and according to the research so will you!