Edward Norton -- Good Genes or Good Docs?

The first rule of Edward Norton's good looks is you do not talk about Edward Norton's good looks.

Here's a 27-year-old version of the "Fight Club" actor at an L.A. shindig back in 1996 (left) and 22 years later ... the Hollywood 'Hulk' -- Who just celebrated his birthday 49th birthday earlier this week -- at some fancy shmancy soiree last month (right).

Incredible!

The question is ...