As HotI said, it isn't set in stone - give it a shot and if it doesn't work out then you can change around again. I have my girls in a shared room. They are 2 years apart in age. I think they like sharing. At least they have never said otherwise lol. They have the biggest room and it easily fits both beds, drawers and all their toys. There is another bedroom that one of them could have had but it is on the low end of a split level house, smaller and I like having a spare room for occasional guests.

I like them sharing. I always imagined having a sister to share a room with. Now they are stuck with my rose-tinted childhood musings lol