@mayintoronto they have slowly improved with time (and regulations). Although there was a setback with asbestos insulation, so you actually don't want to buy an old insulated house in australia.

This one is a fairly extreme example. Having said that I grew up in military housing and they were never better than this. Rentals are rarely better than this. So I reckon it's common in australia for young people to never experienced insulation until they get to a certain [wow I made it] point in life.