"I AM IRON MAN!"
Introduced in 'Tales of Suspense' #39 in 1963 at the height of the Cold War, Iron Man was first conceived as an anti-Communist hero. Over the years, he's become more and more dependent upon technology to live and even battled alcoholism in famous 'Demon in a Bottle' storyline from the 1970s. Still, he's been a member of the Avengers throughout most of his career and has battled everyone from Dr. Doom to the Skrulls. Not bad for a hero nearing retirement age.