Olivia Wilde -- Good Genes or Good Docs?

Olivia Wilde's good looks are getting better in time!

Here's a 19-year-old version of the "House" actress exuding youth back in 2003 (left) and 15 years later ... The now 34-year-old mother of two was spotted looking timeless at the movie premiere for her new film "Life Itself" earlier this week (right).

Wildly beautiful.

The question is ...