Stefan and Damon are very old. It's pretty cool to see how they used to dress.
Added:
How cool is this?!? During the episode Lost Boys, Stefan and Damon are seen in the old days.
Added:

The Vampire Diaries Season 1 Episode 6 Quotes

I'm a vampire.

Stefan

Everything you know, and every belief you know is about to change. Are you ready for that?

Stefan