Robert Downey Jr. turns 51 this year, and we're celebrating by looking back at his transformation from the guy on Sarah Jessica Parker's arm to one of the most successful action heroes in movie history. The actor has had his ups and downs over the years, but thanks to his raw talent, determination, and hard work, he's managed to become the Hollywood success story that everyone compares our current troubled stars to. Keep scrolling to see all the best RDJ shots, from the '80s to today!
Watch Robert Downey Jr. Defy the Laws of Aging
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