Now, give me a cool basement, and I wouldn’t hesitate to try 20 year-old canned food - providing, of course, that the can wasn’t bulged out (none of mine are, by the way), and the contents smelled decent.
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Just a little FYI on this . . . I usually don’t worry about canned food if it’s slightly out of date, but twice lately I’ve had issues. One was a can of tuna that was six months past date. It looked fine so I made some tuna salad . . . that was inedible!!! It tasted like I’d ground up the can and mixed it in with the tuna! LOL! The other was a can of Progresso soup that was only a couple of months past date. Gave me major indigestion. Now, as things stand now, these were minor inconveniences. But if there was no doc available, I wouldn’t want to risk getting sick from weird canned food. So my lesson from this was to try to keep all my canned food stoes within date.
Canned goods containing acidic foods such as tomatoes will eat into the metal of the can so those don’t have such long shelf lives after the expiration dates. I’ve noticed tuna cans are being made with less metal so are more flimsy and likely to not hold up over time. Try pushing the sides and top and you’ll see what I mean and that is a major cause for concern. Canned pet foods, too. I opened 5 national brand canned cat foods (Friskies, I think) just a few days ago that were well within their dates but the meat was black so had to throw them out.
More and more foods are being sold in paper containers (tomato sauce, broth) and in foil packages (tuna, meats, fruit, pet food) which would definitely NOT be good for prepping because it takes just one pin hole to kill someone.