Aslan is anti-matchmaking! He kicks those kids out as soon as they reach puberty, I swear. Susan starts liking boys and it's all over for her. sex = bad obviously.

Narnia's "come back when you're ready" is more like "come back when you are who I want you to be," which is just too much for Susan. She's tired of Narnia being so demanding and would really just like to rest sometimes. England understands that not every day can be hunting and feasting and that growing up is part of life.