No one is building homes to last 150 years in the United States, and very rarely do people want to buy homes built a century ago.
Where I live we call a century-old home a "tear down" because it's probably in horrible condition. There are a handful in my neighborhood but they get sold at a discount, usually for new construction.
That's wild. I live in one of the oldest cities west of the Rockies (granted, that isn't -that- old) and there are whole neighborhoods of century homes, and they're considered desirable. In the last 10-20 years a bunch have been gutted and upgraded -- new pipes, wiring, windows, etc. Maintains the charm but modern efficiency, convenience, and safety. Sure, some become tear-downs, but a pretty high percentage are sticking around. That old growth doug fir is awesome.
I just sold a century home myself, after my mother passed. There was a little bidding war for it, even in this market. There's a character to the century homes that you cannot get in a new home at anywhere near the same price point.
Where I live we call a century-old home a "tear down" because it's probably in horrible condition. There are a handful in my neighborhood but they get sold at a discount, usually for new construction.