Japanese house typically can't be usable after 50 years. That's because of humidity, frequent typhoons, and earthquakes. New building regulations will be intro

Japanese house typically can't be usable after 50 years. That's because of humidity, frequent typhoons, and earthquakes. New building regulations will be introduced every time new anti-earthquake building tech was invented. So the old houses which doesn't satisfy these regulations will be devalued soon. That's why nobody want to live in a old house. Or more like nobody can be able to live in a old house.