Want to know how long you'll live? Ask your friends!

It’s been known for a while that personality traits are associated with lifespan–for example, several studies have found that a positive attitude can help you live longer. But many of these studies use self-reported measures of personality, and these researchers wanted to know whether personality traits reported by others might actually be more accurate. To test this hypothesis, they took advantage of data from a 75-year-long study that followed 600 participants starting in 1935 and continu

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