"In one study published in 2010, investigators examined the results of a survey conducted by 5,630 people when they were fifty-five to fifty-six years of age and, again, when they were sixty-five to sixty-six. Those who scored higher on a measure of eudaimonic well-being at the younger age were over seven times less likely to be depressed ten years later than those whose scores were lower."
Stephen Joseph Ph.D.

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