Eva Longoria: Good Genes Or Good Docs?

Eva Longoria's beauty will go on for-eva!

Here's a 26-year-old version of the "Desperate Housewives" hottie at a Hollywood fashion show back in 2001 (left) and 14 years later ... the restaurateur -- who is celebrating the big 4-0 this weekend -- speaking at a panel in Los Angeles earlier this year (right).