I don't know if this is absolutely standard or whether there are some/many that still have 1 year age groups. At our nursery there are 2 rooms for the 3-5 year olds, so it could be reorganised so that it's one room for the 3 yos and one for the 4s and up or something similar.
Just wondered what people's feelings were about the 2 year stint (potentially) in the same room. At the moment I'm having some doubts about how well it works for the younger ones if there is lots of emphasis on being 'school-ready' for the older ones. Would be interested to hear what others think.