Board Thread:False Info and Speculative Discussion/@comment-24919817-20140825235100/@comment-4950212-20140826005829

Well, yes and no. Peter probably is more like 39/40 in the current time line. Talia and the rest of the Hales were killed six years pior to the first season of the series - so Peter was most like already in his 30s, most likely 32. Plus with the knowledge that Meredith was 16 at the time she went into her first fugue state and with Scott and the rest of the gang are Juniors (all between 16 and 17) in high school I think we can infer at least a year and a half has past since Scott himself became a werewolf and Peter died and came back to life and that Meredith is 17 (if she were 18 she would be been able to leave the Eichen House of her own volition if she's not a harm to herself) and rest of gang are possibly older depending on their birthdays (we do know Lydia had a birthday on March 19th and turned 17 in "The Hunt" episode). Sorry, I'm rambling but Peter probably 39/40 now give or take a couple of months.

Derek on the other hand is much younger than Peter. I'll chalk there youthful appearance to their healing factors because Satomi has to be pushing at least 100  (Lily Mariye, her actress, is 49 but she was in the concentration camps with Noshiko in the 40s and still looks the same). Not even Tyler Hoechlin is sure of Derek's age but I'm going to break down the information that I know of and guesstimate an age for him or the age he probably is. In 1x11 - Formality his driver licenese says that is shown places his age at 23 (it says - November 7th, 1988), which would make him 16/17 at the time of the fire but that's depending on when during the year it happened. However, it was stated that Derek’s driver license was a fake, so his date of birth may have been made up for the fake driver’s license. However in the pilot, Derek was meant to be 19. However the Hale house fire took place 6 years prior to 2011 meaning Derek would have been 13-14 around the time of the fire. But I find that unlikely since we know Derek had a sexual relationship with Kate. But it’s possible tv show so it's still in the realm of possiblity, I guess. Getting back on track, we do see a 15 year old Derek in the flashback episode of season 3 and then we see the a teenage version at the start of season 4. If we say that Derek was 15/16 at the time of the Hale house fire, then Derek would currently be around 21/22 with at least a year passing in the current TW universe timeline.

I hope all my rambling helped. :D