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Personality Similarity and Romantic Relationship Adjustment During the Couple Life Cycle

Over the last decade, a substantial number of studies have focused on the role of personality traits and of the personality trait similarity/dissimilarity in partner selection and in predicting the quality of adult romantic relationships. The present study contributes to this general objective by investigating the correlations between levels of similarity/dissimilarity in partners’ personality profiles, analyzed through the Big Five dimensions, and levels of romantic relationship adjustment at different stage of a couple’s life course. A sample of Italian couples (N = 92 couples; 184 individuals) completed the Big Five Questionnaire and the Dyadic Adjustment Scale. The results revealed that similarity was not directly related with romantic relationship adjustment. Similarity only affected adjustment in interaction with the length of relationship. Partners reporting high levels of similarity in conscientiousness and openness showed the highest levels of romantic relationship adjustment during the first years of their relationship, while showing lower levels of adjustment as the relationship progressed. The lower levels of romantic relationship adjustment fell within the length of relationship range spanning between 10 and 21 years. These results suggest the importance of considering the life cycle perspective when studying the impact of personality similarity on romantic relationships, as well as suggesting the need to analyze the relationship between personality factors and interpersonal processes in a deeper way particularly in counseling and therapeutic contexts.