Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-209.141.131.212-20130709011039/@comment-4091815-20130804071358

You don't know and can't know Derek's Age because it has never been stated on the show. There is no correct age until the writers give him an age and provide that to viewers by way of the show.

Knowing he was 15 in the flashback episode means nothing since there is absolutely no indication of when that episode took place.

Kate's age has nothing to do with Derek's age so there is no support there for your conclusion.

Derek's fake ID is fake and therefore offers no support to any argument.

So what exactly is the purpose of this exercise since all of the information you've been provided offers zero probative value into the question of the character's age.

You managed to weave a bunch of fairy floss but that is in no way a theory.