Um, I might not be checking tommrow because it is Disney Plus day. When are the Netflix Narnia's coming out is another question? There are some none canons.
The Narnia Web uses the Narnia timeline, which is suspect that Lewis even wrote it. There have been many threads here regarding the ages of characters on this site. Here is one of them, though it is an old topic and is mostly 11 years old, with the most recent message seven years ago. I voted 10 simply because I like that round number, but it also represents not only the age of Georgie in the first movie (she had her tenth birthday on set) as well as a good idea for Lucy's age in LWW.