You know how people can look like their dogs?
I was reading this article that this same phenomenon is true for couples that have been together for a long time! It explains that people tend to be more attracted to people with similar features(also known as imprinting).
John Huck, an LA artist, did a photographic installation on couples that look alike here:
Also, couples who have been together a long time can look more and more alike over time. This is because they tend to have many of the same experiences, and many of the same facial lines (like laugh lines). Crazy huh?
pics from John Huck
last pic from Like Alike