Fantastic Beasts and Where to Find Them 2 casting Jude Law as Dumbledore was a bit of a surprise given the actor's age compared to his predecessors - but it turns out he won't be the youngest to play the wise wizard, even in his debut film. Pottermore reports that Fantastic Beasts 2 is currently casting for teen versions of several major characters, including dear old Dumbledore.
The casting call also includes teenage versions for our hero Newt Scamander, his love interest Leta Lestrange, and main bad guy Gellert Grindelwald. There's also a fifth role, simply known as "Sebastian," though whether he'll be a flashback version like the others or just a young person in the film's present is unknown.
We can at least infer some clues about what the casting of the others means for the sequel's plot, though. Newt was quite hesitant to talk about the photo of Leta he keeps, so the casting of both of these characters in their younger years probably means we'll see the formation (and possible dissolution) of their relationship.
As for Dumbledore and Grindelwald, it was revealed in Harry Potter and the Deathly Hallows that the two were once friends, so I'd wager we'll likewise see them go from friends to… well, not friends. What's interesting is that we know Dumbledore's sister was killed when her brother had a duel with Grindelwald, yet there's no casting call for her. Either she doesn't play into this next story or she's already been cast.
