TIL that a 2009 study found that the majority of friendships only last about seven years. Although the number of friends a person has in their social circle remains fairly stable, turnover is high. Roughly 70% of a person’s friend group will change after seven years.

Read more: https://www.huffpost.com/entry/the-seven-year-expiration_b_208468

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  1. Seems like that’s an average time for major life changes

    High school, college, career changes, change of address, married, children etc. Obviously not all 7 years but these events generally cause turnover in close friend groups. Would be curious how this number changes with age.

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