Penn Badgley was on the verge of quitting acting when he was offered the role of Dan Humphrey on this show. He originally turned down the role but was persuaded to join the cast by producer Stephanie Savage.
I'm Chuck Bass.
Throughout the series, it's clear that the actors/actresses portraying teenagers are actually in their 20s+. This is done as to not interfere with the schooling of real teenagers and to give the general viewing audience who are teenagers themselves someone they can look up to.