Continuity mistake: In this film, Prince Caspian speaks with an English accent. However, in the previous film "The Chronicles of Narnia: Prince Caspian", he spoke with a Mediterranean accent.

The Chronicles of Narnia: The Voyage of the Dawn Treader (2010)
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Directed by: Michael Apted
Starring: Ben Barnes, Georgie Henley, Skandar Keynes
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Coriakin: To defeat the darkness out there, you must defeat the darkness inside yourself.
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Answer: He's suppose to be the same age as in the novels, so about 16. "Voyage of the Dawn Treader" takes place 3 years after "Prince Caspian", so 2306 (Narnia year). He was born 2290 (NY). However, since Caspian is around Peter's age, they chose an older actor to play Caspian to match William Moseley's age.
Bishop73