From childhood friends Ben Affleck and Matt Damon to former college roommates Connie Britton and Kirsten Gillibrand, the public sphere is full of friendships as notable for their longevity as they are for their star power.

There are good reasons for why these tales of lifetime BFFs are so appealing.
"Lifelong friends not only know the person you are, but also the person you were," explains Irene Levine, Ph.D., a psychologist and creator of The Friendship Blog. "Having that shared history makes it easier to communicate in shorthand. They understand your roots and may have been witness to other important people and events in your life."

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