You and I who still enjoy fairy tales have less reason to wish actual childhood back. We have kept its pleasures and added some grown-up ones as well.
Critics who treat adult as a term of approval, instead of as a merely descriptive term, cannot be adult themselves. To be concerned about being grown up, to admire the grown up because it is grown up, to blush at the suspicion of being childish; these things are the marks of childhood and adolescence.
It certainly is my opinion that a book worth reading only in childhood is not worth reading even then.