Page 1199 — Big Eyes Small Horses

Which reminds me, if you want to see a great example of a youth-themed D&D mini-campaign, I highly recommend all three sessions of Camp Nettlebee.

DM: So we've got an earth pony, a changeling, a hippogriff, a yak, a dragon, and a griffon. Just a few of the many youths attending the brand-new School of Friendship an… indeterminate number of years in the future. In terms of class levels… well, you're basically children… but it's a one-shot… Let's go with Level 5 and explore the system a bit. We'll say you're all rather exceptional students.
Rainbow Dash: Besides, knowing you, it's not like we're guaranteed to even have combat.
DM: Yeah… that might be true. But that doesn't mean I won't throw you into something quite serious…
Pinkie Pie: Aww, but I wanted to crush our enemies… at school sports! Oooh, that's it, someday I'm running a sports-anime campaign!