In the Last Battle, Peter would be 22.
Peter returns in the final book of the series, The Last Battle. In the Chronicles of Narnia, Susan does not return with the rest of the heroes because she had stopped believing in Narnia when they left this world for the last time (they were killed in a train accident). Whether she returned to a belief in Narnia and then made her own return to Narnia later is not known.
Susan and Peter can't return to Narnia because they have grown too old to enter that world as the magical portal only allows children to pass through. The rules of Narnia dictate that once they have reached a certain age, they are no longer able to access Narnia through the wardrobe.
Peter and Susan won't return because they are too old to come back to Narnia. The journey they made in Prince Caspian was their last; Lucy and Edmund return with their cousin in The Dawn Treader. That was their last journey. After that, none of the Pevensies came back to Narnia until The Last Battle, which was the very last book in the series. In the last few books, the main characters are the Pevensies' cousin Eustace and his friend from school Jill.
In Narnia, 1300 years old
If you listen to what they say at the end of the second movie and book. Peter and Susan have learned all they can from Narnia and they are getting to old for Narnia.But if they make all the books into movies there charachters return in the Last Battle.except for Anna's charachter Susan because she no longer belives in Narnia and thinks it was a childish game the played.
Susan is in America and Peter is studying at a university in England during the events of "The Voyage of the Dawn Treader". They do not return to Narnia in this installment of the Chronicles of Narnia series.
Moseley's character of Peter and Popplewell's character of Susan are not featured in the book "Voyage of the Dawn Treader". they were told at the end of "Prince Caspian" that they were too old to return to Narnia. However, sites listing the cast for "Voyage of the Dawn Treader" also list Moseley's name, so it is yet to be seen how Peter will come into the story when he is not in the original book.
It all depends on which movie they are filming. If it is after Prince Caspian then Susan and Peter will no longer appear since they are to old to enter Narnia. If it is after The Voyage of the Dawn Treader then Lucy and Edmond will no longer appear since they to are now to old to enter Narnia. It progress in such a manner if they choose to produce all the Narnia movies. However, Peter, Lucy and Edmond do come back in the Last Battle.
Peter Pevensie is a fictional character in "The Chronicles of Narnia" book series created by C.S. Lewis. He is about 13 or 14 years old in the first book, "The Lion, the Witch and the Wardrobe," and is the eldest of the Pevensie siblings.
The character of Susan does not appear in the book The Voyage of the Dawn Treader (except in a short scene in Lucy's thoughts alone), so she will not be appearing as a main character in the film, just in a short cameo appearance, as will William Moseley (Peter) and even Tilda Swinton (the White Witch).
The old Narnia is destroyed and all good Narnians and friends of Narnia are brought safely into the new Narnia (Aslan's Country) forever.
19 yrs old well he was in the book i mean edmond