Reallytired .... the citizens of a mature Japanese economy did suffer, especially as a nation of savers, and the Japanese version of their Base Rate was 0.1% was a very long time - and the fabled returns on their stock markets for many years, a distant memory - at the same time Japanese companies were relocating industrial production to much cheaper surround emerging countries.
Their main problem was their over banked banking system that wasn't encouraged to write off their bad debts, so three badly damaged banks would merge and form one large damaged bank - so became what some people later called ours for a while, 'zombie banks', but far, far, worse.
The government of Japan for many years had an aggressive UK QE type government bond buying operation every month, but still failed to break the mild deflation cycle - and it wasn't until a few years ago when the Bank of Japan aggressively sought inflation through further money printing etc, that Japan finally broke that cycle.
The Japanese birth rate was not such a problem when what was called 'hollowing out' their economy to the citizen workforces of cheaper surrounding and western countries - but certainly is as their labour costs rise, and so Japan wanted to bring their work back home.