Robert Downey Jr. Good Genes or Good Docs?

Robert Downey Jr. really is back ... better than ever.

Robert Downey
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.











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