Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-209.141.131.212-20130709011039/@comment-11533671-20130807151526

None of this really tells Derek's age though. We don't know it. So far all we DO know is that he is older then you think but not as old as you'd think. Even Peter saying that Derek was 15, we do NOT know and cannot know if he is giving us Derek's REAL age. Sort of like when Cora answered Stiles about how old she was.