In D&D, the standard assumption is that elves mature just as fast as humans, but they are culturally treated as children until around hundred or just a bit higher. But I’ve started developing a campaign setting where elves really are the equivalent of kids until that age, and all the implications of that. One of which is that, if humans attended school alongside elven kids, they’re going to lose their reputation of mystique and wisdom— they’re going to be viewed as kinda slow and dimwitted, as the humans graduate through the grades and the elevens get held back a decade or so.