McCourt is too young to be the Wizard. He is an elderly man, and I have seen McCourt's portrayal. It would have been okay if his character wasn't the Wizard. He looked like he was Elphaba's age, which wouldn't make sense to the plot.
"Do you know what pledge time is, Andrew"? said the PBS Executive.
"Yes", Lloyd Webber replied. "My 50th birthday special must be one program that gets done a lot."
"No", mused the man from PBS heedlessy. "Not so much. Our Stephen Sondheim Carnegie Hall concert. That's a big one."
Spoons, forks and knives seemed suddenly to suspend their motion in horror, all around the table.