Eating food rations form WWII maybe is an extreme, but in generla, if hygienically correcly filled and the can is good quality material, food in cans will remain perfectly consummable for much much longer than the printed date. In Asia coutnries cnaned food doe snto even have date stamps on it.
20 years? No problem. If the can and filling process was good quality at the tiem of making.
I still have some cans of pea-potatoe soup, which formed my ground stock of reserve building back in days when i was a bit short on money. They are 15 years old now. And they still are fine. 3 or 4 still are left. Think its time to buy another dozen of them now. It tastes good.
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