I realized they were going young with the prequel/relaunch, but maybe not this young -- McAvoy is a youthful thirty-one years old. Honestly, McAvoy's a great choice for a young Professor X, but I never pictured the Professor starting the school and leading the X-Men right out of his twenties.
The big question is who will make the team in X-Men: First Class? Is it a true prequel to the established franchise or is it a re-launch, and, if it is a relaunch, will audiences be onboard for two different X-Men franchises at the same time (since Fox is going forward with a sequel to X-Men Origins: Wolverine)? If First Class sticks with the actual first class at Xavier's school, we'll see a team comprised of Cyclops, Jean Grey, Angel, Beast, and Iceman, but Fox told Hollywood Reporter we'll be seeing a group of mutants with "some familiar, some new." Interesting.
I'm sure we'll have more casting news on X-Men: First Class soon -- Fox has already claimed the June 4, 2011 weekend to take Marvel's mutant superheroes back to school.