You should be rotating your inventory.
Let's say you want a five-year insurance policy - i.e., five years' worth of "protection" against "Crazy Times" lasting five years.
That means that you buy, all at once, as much of the given foodstuff as you would normally consume over a course of five years.
You then immediately begin consuming your stockpile - and simultaneously replacing each individual can of tuna or what-have-you as you consume it.
For the following five years, you are consuming food that is gradually growing older. By the end of that 5-year period, you are consuming food that is 5 years old. Here, you have reached a plateau. If you continue with this system, you will be eating five-year-old food for the rest of your life - but you will always have a five-year supply of foodstuffs on hand.
But then, you probably know all of this already!
Regards,
I do rotate...but every now and then I find a stray. I’ve started marking the best by dates on the label with a permanent sharpie for better visibility. Also doing periodic inventory to make sure I’m not forgetting something and everything in the pantry is tidy with new stuff in back.