If you open a tin can of something and can see rust anywhere inside, I would throw it out. It probably would not make you sick, but it will taste "off" with some kind of metal taste that I don"t like. Of course, any can that leaks or is bulging should not even be opened, but just put in the garbage.
That said, I have eaten canned food that was probably at least 10 years old with no bad effects. It probably would have been better if it had been eaten sooner, maybe, but it tasted OK.
We do quite a bit of home canning, and sometimes canned food ends up being several years old before we get around to eating it. If the jar sealed properly when the food was canned, I figure it is OK for a long time, assuming that the seal remains perfect and it pops when I open the jar. Again, unless there is rust on the inside of the metal lid, it is probably just fine. It does not seem to make much difference if the food was canned last season or several years before. We store our canned foods in a very dry and usually very cool and dark room in the basement.
I do try to use my oldest canned goods first, but occasionally there gets to be something that is hidden or misplaced for a while. It probably would be a good idea to only use things that are within the "best used by" date on the can, but in my experience, most canned goods are fine long after that date. My daughter is a registered dietician and she disagrees with me strongly on that point, but I tend to do what I think is best for me...Good luck!
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