Gabrielle Union: Good Genes or Good Docs?!

Gabrielle Union ... she’s all that!

Here’s a 29-year-old version of the Hollywood hottie flashing her pearly whites at a movie premiere back in 2001 (left) and 14 years later ... an even sexier version of Dwyane Wade's wifey -- who celebrated her 43rd birthday earlier this week -- at a fancy New York party last month (right).

Old age? Bring it on.

The question is…