…if we are to use the words childish or infantile as terms of disapproval, we must make sure that they refer only to those characteristics of childhood which we become better and happier by outgrowing; not to those which every sane man would keep if he could and which some are fortunate for keeping.
If we are resolved to eradicate, without examining them on their merits, all the traits of youth, we might begin with this—with youth’s chronological snobbery.
–C.S. Lewis, from An Experiment in Criticism
Actually, the association of children and fairy-stories is an accident of our domestic history. Fairy-stories have in the modern lettered world been relegated to the “nursery,” as shabby or old-fashioned furniture is relegated to the play-room, primarily because the adults do not want it, and do not mind if it is misused. It is not the choice of the children which decides this. Children as a class—except in a common lack of experience they are not one—neither like fairy-stories more, nor understand them better than adults do; and no more than they like many other things. They are young and growing, and normally have keen appetites, so the fairy-stories as a rule go down well enough. But in fact only some children, and some adults, have any special taste for them; and when they have it, it is not exclusive, nor even necessarily dominant. It is a taste, too, that would not appear, I think, very early in childhood without artificial stimulus; it is certainly one that does not decrease but increases with age, if it is innate.
–J.R.R. Tolkien, from “On Fairy-Stories”