User blog comment:SayuriDarling/Alexandra Daddario as Annabeth Chase./@comment-1807651-20100107221851

i think the prophecy was moved up to 21...but i'm not sure...they're supposed to be (in the movie) 17 in the lightning thief, 18 in Sea of Monsters, 19 in The Titans Curse, 20 in Battle of the Labryrinth, and 21 in The Last Olympian.