I would like to keep everyone in the same year but am open to the possibility of different years. I think it would be hard to keep different year players involved in certain situations such as classes, or even as simple as meeting on the train their first year or if after graduation of the marauders some players are still at Hogwarts. The intention is not to play out every single moment of every single year but to jump around a bit. Some first year relationship building and we don't even have to jump to 2nd year we could conceivably jump from 1st to 3-5, and round out with 7th year before moving onto adulthood dependent on how players would like to see the story and their characters progress.