Started myself in January at 46, had a couple of months in undergrad halls before there was a space in the postgrad/mature halls. Both were fine, though have to admit to being more relaxed in the postgrad hall. When I moved out of my first flat my 18/19yr old flatmates were complaining that I was abandoning them!!
Whatever you decide you will love it, uni is a great experience, age doesn't seem to be a big issue. What course are you doing and where?