A 12-year study suggested that depressive symptoms in couples change over time together, albeit in different proportions. This conclusion was reached by scientists from the Charles University in Prague.
A 12-year longitudinal study looked at how depressive symptoms in partners changed over time. Four distinct characteristics of these changes were identified. It has previously been suggested that depressive symptoms may overlap in couples, suggesting that one partner's symptoms may influence the other's. This assumption was based on an independent theory that, over time, the traits of the partners in a stable relationship begin to influence each other.
Age partners get more pleasure from sex
Most of these studies have looked at individual trajectories of depressive symptoms, but now the Czech scientists have followed them together. It is well established that, over time, partners become psychologically more similar than different, although there may be many possible explanations for this.
Children from happy families are stronger in the future more faithful partners
In addition, the psychological compatibility of partners at some point in time does not explain in great detail how their characters change over time in relation to each other . And this was especially interesting in the context of the similarity of mental health, the fluctuations of which scientists have observed over such a long period of 12 years. (READ MORE) 
Charles University
Medicine
the main university in the Czech Republic, the oldest university in Central and Eastern Europe and one one of the oldest classical universities in the world, was founded by the King of Bohemia Charles IV of Luxembourg in 1348