Fair Faun said "I actually thought Lucy looked slightly younger at the end of PC than she did in the middle of it. Perhaps they shot the beginning and the end scenes with the station at the same time".

Yes, I am sure they did all the railway station shots in the same period of time. After all, Lucy had to look the same when she got back in the same instant of time as she left! Imagine how strange it would be to people watching if she was suddenly taller and more mature looking!

According to Lewis's timeline, here are the characters' ages in the books:

LWW:
Edmund - 10
Lucy - 8

PC:
Edmund - 11
Lucy - 9

VDT:
Edmund - 12
Lucy - 10

Just for clarity, in LWW it says that there is only one year between Edmund and Lucy.

And Edmund gave a very superior look as if he were far older than Lucy (there was really only a years difference) and said, "Oh yes, Lucy and I have been playing"

Unless you're meaning that Edmund had just turned 12 and Lucy was very nearly 11.

yeah i noticed that to. She has changed so much from pc to vdt, she loosk a lot different.

I like the movie ages better, mostly for the reasons mentioned above. Its more sutible when they become kings/ queens, or enter a battle, or get married for them to be older. Also if you listen to the commentary on LWW they talk about how Peter is growing from a boy to a man, and I think the movie ages better reflect that.

Lol! That would be funny if she came out more mature looking. I think It's better with them looking older, it would make more since of them being too old for Narnia.

I never realized how much difference there was between the two... I guess because we can actually picture the characters in the movie, the movie ages seem better to me.

For me, the ages don't matter so much as the maturity level. I honestly always thought that the characters in the books were much older than they actually were, because of how mature they acted. So, the movie ages seem so much more natural to me, because it helps bring out the maturity in the characters. Plus, it just makes more sense.

The book ages do seem a bit young, but then again the movie ages seem a bit too old. It's really hard to imagine Edmund as only 12 in VDT, and Lucy as only 10. I always imagined that more than a year had passed between PC and VDT, even though it says differently in the book.
Although really, once they enter Narnia, they do become older, in a sense, so I suppose their ages don't matter too much.

I think if they have actors that look younger than they actually are it's ok (Eustace and Lucy) But in PC Susan, Peter and Edmund looked so old they didn't look like kids. It was ironic in the movie when Edmund said 'We are kids, remember?' when really that was a complete lie. Even Lucy was a teenager.

Actually Georgie was not yet a teenager when they were filming PC.

I have noticed that the book ages are rather like those in a lot of English children's books, in that the children seem to be very knowledgeable and capable for kids still pre-teens. But then it's a convention of that period of stories. And maybe English children DID know all that history and so on?