My old-aunt (not sure if that is something in English but she was an aunt of my father) and her husband ate only expired food until they died (both over 95, aunt over 100); I was, as a kid, always disgusted as everything you got there was rotten (fruit etc) and/or had mold (bread) ; they just cut it off or even just ate it. Because they had a house close to my uni, I lived with them for a while as a student and it was horrible; I eventually got a little fridge in my room as simply everything was expired, and then some. They survived 2 wars and, although they had plenty of money, they knew (and wanted to??) how to live of nothing. So they bought or got (for free) only expired food. They also were very religious and that helped with the money thing; they both washed with cold water their whole life and the heating in the house (in the netherlands!) was generally off; there was ice inside my room as a student. I knew more (as in; yes they were weird to me but not so much for the generation) people who survived the 2 wars who could not shake this kind of thing even though after those events they made a good to great living.