Exactly.

It is still possible, even in an age so ferociously anti-romantic as our own, to write fantastic stories for adults: though you will usually need to have made a name in some more fashionable kind of literature before anyone will publish them. But there may be an author who at a particular moment finds not only fantasy but fantasy-for-children the exactly right form for what he wants to say. The distinction is a fine one. His fantasies for children and his fantasies for adults will have very much more in common with one another than either has with the ordinary novel or with what is sometimes called "the novel of child life."  Indeed the same readers will probably read both his fantastic "juveniles" and his fantastic stories for adults. For I need not remind such an audience as this that the neat sorting-out of books into age-groups, so dear to publishers, has only a very sketchy relation with the habits of any real readers. Those of us who are blamed when old for reading childish books were blamed when children for reading books too old for us.  No reader worth his salt trots along in obedience to a time-table. The distinction, then, is a fine one: and I am not quite sure what made me, in a particular year of my life, feel that not only a fairy tale, but a fairy tale addressed to children, was exactly what I must write—or burst. 

C.S. Lewis, from "On Three Ways for Writing for Children"