Frank Kogan

That wiki list conflates a lot of different types of youth-lit, obviously: the dumas is interesting, because it fits more into a category of book which was written for grown-ups but became "children's classics" (cf pilgrim's progress; gulliver); my guess is that the versions of dumas that became books-for-kids would have been shortened and simplified; this was a standard practice in 19th-century publishing (and actually a pretty good idea was has gone out of fashion rather; it will happens a little with classics that have gone out of copyright)

the "idea of teen" probably emerges with rousseau's "emile", and later goethe's "young werther" (real title: young emo) -- the term juvenile delinquent dates back to the 1810s, and savage dates the phenom of "what to do with our mardy youth", as a newspaper editorial discussion point, to round the 1870s -- the word "teens", as one writers' shorthand for urban gangs, to the 1890s

i'd forgotten there's a section on p.pan in savage's book, so am glad you brought it up!!