Board Thread:False Info and Speculative Discussion/@comment-5379216-20140705054016/@comment-19765459-20140722213642

84.195.100.216 wrote: Ithink hes older then 25 since if u watch THE scène in visionarie with styles Peter and cora u hear Peter say hes not as young as he could have been but also not as old as styles thinks .and i could be completly wrong here but maybe werewolfs dont age as regular human beings

They probably don't. However (and I'm guessing here) I'm willing to bet that this was just screwing with Stiles over the fact that werewolves very probably follow a lunar, rather than a solar, calendar, which is a bit shorter and thus they can play around with Stiles because they count their ages on both a lunar calendar and the Gregorian Calendar.

While it is plausible that they live longer, young!Peter from the flashback was a lot younger than Peter now. So either the flashback visuals were off, which does not appear to be the case since the same actor plays teen!Derek both in flashback and present time, or else Peter has noticeably aged since the Paige incident, which at this point was probably around 8 years ago. After all, werewolf kids could no possibly be aging more slowly than human ones. The Hale's all attended the Beacon Hills public school system and people would notice if it took them 30 years to reach adulthood!