Robert Downey Jr. really is back ... better than ever.
Here's 25-year-old Downey back in 1991(left) -- and 18 years later, the 43-year-old version at the Oscars this week (right).
Getting arrested and going to rehab a bunch of times really does the body good.
Robert Downey Jr.
Good Genes or Good Docs?
3/1/2009 5:30 AM PST BY TMZ STAFF
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