Heather Graham GOOD GENES OR GOOD DOCS?

0815_heather_graham_good_genes_docs_launchHeather Graham is a timeless beauty!

Here's the then 18-year-old "License To Drive" actress at a Los Angeles movie premiere back in 1988 (left) and 26 years later -- the now 44-year-old  "Hangover" hottie outside of a theater in New York City earlier this week (right).

The question is...