Some of that is survivorship bias however. Crappy homes from the 1600s aren't around anymore. The longer an area has been built up the larger percentage of the houses are well built due to the poorly built houses constantly dying out by the well built houses sticking around.
True, I won't disagree with that, but in the small town I live in most of the houses in the middle of town are 100 to 150 years old - and there aren't many 'missing houses' that have been replaced with new ones since they weren't good enough to last (as far as I can see).
Even in London, the terraced house we own is about 150 years old, as are all the houses in the street and pretty much the area - very few of these needed replacing unless they were bombed in the second world war, or some other catastrophic event.
