I started putting together this list while watching the third season of My Hero Academia, wondering at how often I've seen "Academy" styled fictional media, and then wondering how far back this trend went and what it looked like. The below list is the result of some light investigation.
In this case "magic" means anything which is not perfectly mundane, and so is inclusive of things like superheroes and sci-fi stories where the focus is on special young people doing special things.
Did I miss any?
1963 | The X-men | comic book series 1968 | A wizard of Earthsea | novel 1974 | The Worst Witch | novel 1985 | Ender’s Game | novel 1988 | Groosham Grange | novel 1990 | Spellcasting 101: Sorcerers Get All the Girls | game 1991 | Wizard’s Hall | novel 1994 | The Secret of Platform 13 | novel 1997 June | Harry Potter | novel 2007 September | Umbrella Academy | comic book series 2013 March | Little Witch Academia | anime 2013 July | RWBY | anime-style web series 2013 October | Kill La Kill | manga 2014 July | My Hero Academia | manga