I have a theory. Hear me out:
You know the ending scene, the moment Douxie flies on the airship with Archie and Nari and THEN the scene blacks out to them walking the streets of New York and being stalked by Bellroc was actually... a time skip? What if the ending scene with Douxie and Nari blending within New York takes place in the fall, about a month or two after the events of Wizards?
If Aaron says that the trilogy takes place within an entire year, maybe Jim will be 17 in the events of Rise of the Titans, since Aaron admitted his birthday takes place somewhere in the fall, around October.
Maybe Claire's birthday takes place in the summer and she was probably 17 during the events of Wizards.
What do you think?