Jimmy Carter Good Genes or Good Docs?!

1/28/2009 6:00 AM PST BY TMZ STAFF
As far as U.S. Presidents go, Jimmy Carter will always be 39th.

Jimmy Carter

Here's the 54-year-old during his administration back in 1978 (left) -- and the 84-year-old version (right) at a NYC bookstore on Monday.

Peanuts do the body good.