I have b/g twins who were 7 in July. They have their own bedrooms but the girl twin never sleeps in hers, so we put an extra bed in the boy twin's room so she can sleep there. We have a (surprise, miracle) baby on the way and no rooms left! Our 2 year-old DD needs her own room, sharing with either of the twins or a baby would be a catastrophe. Thinking of changing my daughter's room to a baby room for a few years, since she never sleeps there. Am I crazy to do that? What age is too old for sharing? They could each have their own furniture/desks/bureau in my son's room, it is quite large. But what about privacy for opposite sex kids? They don't care AT ALL right now...how soon should I expect them to start? Thanks!