Why spouses get similar to each other?
Often looking at a married couple, you can see the external similarity between partners. In some cases, people form people, initially outwardly similar to each other. Scientists explain this presence of a greater unconscious confidence in a person whose appearance is close to our own. But there are many cases when unlike each other partners over time became similar as twins. This is a scientific explanation.
From the point of view of psychology, any human communication is an invitation to the experience of joint emotional experience. Communication is possible due to the recognition of emotional reactions and exchange them. People who make up a couple communicate with each other for many years and have well-studied emotional cards of each other. This is what is connected with the phenomenon of the external similarity.
Thanks to the mirror neurons, a person has the ability to try on the state of other people and experience them. Such reading of emotions occurs in automatic mode, bypassing consciousness

In the 1990s, Italian neurophysiologists opened mirror neurons that are responsible for the human ability to empathy. These are special cerebral cell cerebral cells that allow people to relate someone else’s emotional experience with their own. Thanks to the mirror neurons, a person has the ability to try on the state of other people and experience them. Such reading of emotions occurs in automatic mode, bypassing consciousness. We can say that when we communicate, then literally "infect" or "infect" emotions of the interlocutor.
Relationships, especially close and long, are impossible without understanding and some mutual adjustment of partners. Such a mirror psychological adjustment to the individual characteristics of the partner affects the expression of the face, facial expressions and gestures. For years, as they deepen and develop relationships, the ability of partners to understand and fasten each other to each other. As a result, a close mental connection between people is literally imprinted on their faces and appearance, which can be viewed as another argument in favor of inseparable soul and body.