I've had this graphic hanging around for quite a while, so it may be out of date. I think the point of it is that like much data the figures are fascinating but it is quite difficult to interpret. Why do boys leave home earlier than girls? Why is there such a big difference between countries. Although obviously there will be differences between those countries where young people normally leave home to go to university and those where they usually move to another town or city. And I am sure some of it is explained by socio- economic factors. It costs money to leave home. But I am not sure this explains it all. I would be very interested in anyone else's perspective on this data.