Let me ask this: what's the youngest age we should be able to play?
And I did a little digging. In the Wizarding world was eleven known schools.
Here are the ones I got info on.
Mahoutokoro - an ancient Japanese school with an incredibly small student body. Here, they are flown back and forth to school on the backs of giant storm petrels. The ornate and exquisite palace of Mahoutokoro is made of mutton-fat jade, and stands on the topmost point of the ‘uninhabited’ (or so Muggles think) volcanic island of Minami Iwo Jima. Students are presented with enchanted robes when they arrive, which grow in size as they do, and which gradually change colour as the learning of their wearer increases, beginning a faint pink colour and becoming (if top grades are achieved in every magical subject) gold. If the robes turn white, this is an indication that the student has betrayed the Japanese wizard’s code and adopted illegal practices (which in Europe we call ‘Dark’ magic) or broken the International Statute of Secrecy. To ‘turn white’ is a terrible disgrace, which results in instant expulsion from the school and trial at the Japanese Ministry for Magic.
They are known not only for their academic prowess, but for their outstanding reputation for Quidditch.
Uagadou - set in Africa, it is the only one out of eleven that has withstood the trials of time. The graduates are especially well versed in Astronomy, Alchemy and Self-Transfiguration. The wand is a European invention, and while African witches and wizards have adopted it as a useful tool in the last century, many spells are cast simply by pointing the finger or through hand gestures. This gives Uagadou students a sturdy line of defence when accused of breaking the International Statute of Secrecy (‘I was only waving, I never meant his chin to fall off’). Students receive notice that they have gained entrance at Uagadou from Dream Messengers, sent by the headmaster or headmistress of the day. The Dream Messenger will appear to the children as they sleep and will leave a token, usually an inscribed stone, which is found in the child’s hand on waking. No other school employs this method of pupil selection.
Castelobruxo - a Brazilian school deep in the rainforest. The fabulous castle appears to be a ruin to the few Muggle eyes that have ever fallen upon it (a trick shared by Hogwarts; opinion is divided on who got the idea from whom). Castelobruxo is an imposing square edifice of golden rock, often compared to a temple. Both building and grounds are protected by the Caipora, small and furry spirit-beings who are extraordinarily mischievous and tricky, and who emerge under cover of night to watch over the students and the creatures who live in the forest. The fabulous castle appears to be a ruin to the few Muggle eyes that have ever fallen upon it (a trick shared by Hogwarts; opinion is divided on who got the idea from whom). Castelobruxo is an imposing square edifice of golden rock, often compared to a temple. Both building and grounds are protected by the Caipora, small and furry spirit-beings who are extraordinarily mischievous and tricky, and who emerge under cover of night to watch over the students and the creatures who live in the forest.
And of course there is the Beauxbatons Academy of Magic and Durmstrang.