Mark Davis/KCA2014/Getty Images
But the amazingly resilient actor is only 49 as of today—a very happy birthday to you, sir!—and we thought it a perfect time to take a look back at the incredibly successful decade the movie star has had.
Downey, who went through the personal ringer in his 30s, only to bounce back better than ever in his 40s, has never been shy about giving shout-outs to his own troubled past.
Accepting the Kids' Choice Award for Favorite Male Buttkicker last Saturday, the actor told the adoring crowd: "This is the highest honor yet bestowed on me—I'm grateful, humble, the whole deal. You know I wasn't always a buttkicker. In fact, life has kicked my proverbial butt countless times in many ways for many years, until I decided one day to start kicking back. Now look at me!"
Both his candor and his irrepressible tongue-in-cheek (well, for the most part) self-congratulatory ways have really only served to make him more likable. But of course, none of that would matter if he didn't also walk the walk on the big screen.
Here are five roles that defined a decade for Downey: