What is the fine-grained topic of the following text: A girl of twelve may take up Jane Austen, a boy Dickens; and you wonder how writers of juveniles have the brass to compete in this field, blithely announcing their works as “suitable for the child of twelve to fourteen.” Their implication is that everything else is distinctly _un_suitable. Only return the topic.
The criticism towards children's book writers who deem their works as the only suitable reading for children aged twelve to fourteen.