‘The Big Bang Theory’ star Jim Parsons on why he’s ‘grateful’ success didn’t come until his 30s

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Jim Parsons, known to many as theoretical physicist Sheldon Cooper on “The Big Bang Theory,” has spent nearly his whole life acting. Despite his rise to fame during the decade-long comedy series, Parsons, 43, tells Sunday TODAY’s Willie Geist why he’s glad his big success came in his 30s.