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Who you are at 30 is who you’ll be for the rest of your life-at least personality-wise.
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That’s the contention of Robert McCrae, a research psychologist at the National Institute on Aging, in Bethesda, Md., which conducts studies on the process of growing older.
Although McCrae says researchers aren’t certain why, our basic personalities are set by our third decade.
But if you’re determined to make a change, don’t despair. You certainly can alter behavior. “If you’re shy, you can take an assertiveness-training course,” says McCrae. “But you’re still going to be basically shy.”