You seem to be confusing a cause and an effect. Japan has been having slow population growth, which turned negative more than 10 years ago, and a stagnant econo

You seem to be confusing a cause and an effect. Japan has been having slow population growth, which turned negative more than 10 years ago, and a stagnant economy in the past 30 years. In these conditions housing does not appreciate well and is not a good investment. When Japan had a growing economy and increasing population it had 100 year mortgages: https://money.cnn.com/magazines/fortune/fortune_archive/1990/05/21/73567/ https://money.cnn.com/magazines/fortune/fortune_archive/1990...