Aslan told Susan and Peter at the conclusion of Prince Caspian that they had grown too old for adventures in Narnia and that they needed to learn to live in their own world.
yes they are i saw the trailer yes they are but have very small parts as they are to old to go to Narnia they only appear when Lucy is reading susans letter and when Lucy wishes she was susan in a...
In the chronicles of Narnia, Peter is the eldest sibling. He protects the other siblings when they first arrive in the magical land. Susan is 2nd eldest, then Edmund, then Lucy.