That was not what I meant in my original reply. Teenagers' brains are different from that of an adult - different in a way that a 30-year-old and a 50-year-olds brains are not different.

So, to be clear, the original claim was that teenagers are adults minus the experience. That claim is demonstrably not true. See http://www.npr.org/templates/story/story.php?storyId=1241194... or any other story that pops up when you Google "teenage brains."