Chevy Chase Good Genes or Good Docs?

12/23/2012 3:35 AM PST

Chevy Chase: Good Genes or Good Docs?

Clark Griswold aka Chevy Chase is having the holiday of a lifetime.

Here's the 46-year-old comedian around the time "National Lampoon's Christmas Vacation" came out in 1989 (left) -- and 23 years later, the 69-year-old former "Community" star at an event earlier this year (right).


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