The 7-Year Rule: How Science Identifies True Lifelong Friendships

Published: 7/23/2026 10:30:00 AM

The 7-Year Rule: How Science Identifies True Lifelong Friendships

A study by Dutch sociologist Gerald Mollenhorst reveals that over half of our friendships tend to fade within seven years due to shifting life stages, locations, or priorities. However, friendships that survive past this critical seven-year milestone possess a much stronger foundation, built on mutual effort and bonds that have been thoroughly tested by time.


Key factors like shared interests, physical proximity, and the dedication to stay connected across long distances are crucial for a friendship to last decades. This explains why friend groups naturally shrink with age—it is a filtering process where only the most resilient, high-quality connections remain. 


If you have a best friend who has stood by your side for over seven years, science suggests they are likely in it for the long haul. 


#FriendshipGoals #PsychologyFacts #RelationshipAdvice

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