Why do old couples who've been married for a long time start to look like each other? Science has the answer!
University of Michigan psychologist Robert Zajonc analyzed photographs of couples taken when they were newly weds and those taken decades later:
The results showed that the couples had grown to look more like each other over time. And, the happier that the couple said they were, the more likely they were to have increased in their physical similarity.
Zajonc suggested that older couples looked more alike because people in close contact mimic each other’s facial expressions. In other words, if your partner has a good sense of humor and laughs a lot, he or she will probably develop laugh lines around their mouth — and so will you.