Sheryl Crow -- Good Genes or Good Docs?

Sheryl Crow's look is a little bit country and a little bit rock-n-roll!

Here's the then 33-year-old "All I Wanna Do" singer at an APLA benefit back in 1995 (left) -- and 18 years later -- the now 51-year-old mother of two at a gala in New York City this year (right).