Not a casting name, but just a question for the folks as far as the actual casting age of Robin, whether Dick, Tim Drake, or otherwise: should the film have a younger actor play the role, if possible, or someone who may not look young, but you feel would be good for the role anyway. Consider, Chris O'Donnell was 25 for Batman Forever and in no way looked like a teenager, though not like Batman Forever was looking for a super young ward. Heck, as young as Peter Parker looks now in Civil War, Tom Holland himself is already 20.
I don't mean like Chloe Moretz as Hit Girl young, but someone who could believably pull off a young looking sidekick.