Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-209.141.131.212-20130709011039/@comment-11533671-20130804165302

You are correct, I don't and can't really KNOW Derek's age because it hasn't been stated on the show. So let's look at what we DO know. According to Derek's wikia page: "While still in high school, Derek entered into a relationship with Kate Argent. He was unaware that Kate was only using him to get close to his family." (http://teenwolf.wikia.com/wiki/Derek_Hale) This seems to refute your notion that Kate's age has nothing to do with Derek's age, since he was in high school. Her age is given so therefore we CAN give a pretty good guess to his age. This isn't about his REAL age, it is about his approximate age during events. In other words, his REAL age doesn't matter much but he has to be able to pass for an age that would place him in high school during the events on the show.

Peter's tale is about HIM, not Derek (an assumption based on clothing and hair styles worn in the episode among other indicators the show has provided) so therefore we still do NOT know Derek's age. But let's assume that Peter the sociopathic werewolf told the truth about it involving Derek.

We can pinpoint the clothing and hairstyles to late 80's to early 90's based on indications in the show (despite you saying there weren't any). Paige wears waist cut jeans with boots and the black friend of "Derek" has a hairstyle that isn't consistent with the time Kate Argent would have been in high school. Since we KNOW from the show that she and Derek dated for a little bit then we can see that Derek could NOT have been in high school earlier. IF Derek were 15 then Kate Argent could only have been between 6-12. This seems pretty creepy and in no way could they have been attending high school together at this time. This is all based on events and information from the show.

Even if Peter was telling the truth, since Derek's ID has him born in '88 and he uses the ID in the show (doesn't matter if it's fake, in the show he uses it for ID) then he attended high school beginning in 2000 at the earliest which by the fake ID he would be 12. So now we know that the ID is at least off by 2 years IF he were 14 and a freshman in 2000 and we can assume that he didn't give the school a d.o.b. of '88 for their records. The entire show begins in 2011. We know that Kate set fire to the Hale house 6 years prior to this in 2004. This makes Derek's high school years fit the 2000-2004 period.

IF Derek dated Paige while a sophmore and 15 then the date would be about 2001 in the flashback. (Way too late for a young Peter to be there unless he ages 20 years in the span of only 2 years!) This makes Kate Argent 18 in 2001. Paige dies and sometime between her death and the fire in 2004, Derek hooks up with Kate. So now based on the show, Derek is between 15-18 when he and Kate hook up and she would be between 18-21. We KNOW Kate started the fire when she was 21 and we KNOW Derek was at school so he has to be a senior and pass for 18 when the fire happens.

All of this is based upon events and ages of other characters that are seen in the show. The show has placed Derek in some of these events and therefore we can arrive at approximations based on evidence that is more logically sound then some half strung theory as you suggest this is.