Young things ought to want to grow. But to carry on into
middle life or even into early manhood this concern about being adult
is a mark of really arrested development. When I was ten, I read fairy
tales in secret and would have been ashamed if I had been found doing
so. Now that I am fifty I read them openly. When I became a man I put
away childish things, including the fear of childishness and the desire
to be very grown up.
C.S. Lews, On Three Ways of Writing for Children, emphasis mine.