Robert Downey Jr.

Good Genes

or Good Docs?

5/9/2010 4:35 AM PDT BY TMZ STAFF
Robert Downey Jr. is a super hero.


Here's the 22-year-old "Less Than Zero" star back in 1987 (left) -- and 23 years later, the 45-year-old version at an event in Beverly Hills last month (right).

Iron man, indeed.