One question I have to ask; did Lewis ever state an age in the book? It's obvious anyway that they weren't going to make Jill NINE in the Silver Chair, so why would it matter so much?

Well, he calls them children, and 18 is considered an adult. THATS why it's a problem.

It stinks simce Will put on the best performance in VDT, but there's no logical choice but to recast him. No one expected him to be 9, but 18 years old and 6 feet tall won't work. Escpecially since the series has been put on an indefinite hiatus, who knows when the next movie will get made (if it ever does). It could be four or five years before it comes out. He won't be able to realistically play someone still in school. The choices Eustace makes in TSC wouldn't be made by a grown adult. Once again, it stinks, but the only way it could possibly work is if they made drastic changes to his character and the story. Do we really want that to happen?

I think the age problems started back when they cast LWW. The Pevensies, while older than they were in the books, were not too old to play their respective characters. But they didn't account for the fact that it would take two to three years to make each film, while the gap inbetween stories is usually a year or less. By the time they got to VDT, they had to cast Eustace according to how old Lucy and Edmund were. Will wasn't way to old to play him then, but with the wait in between movies, he is now way too old.