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Today I got confirmation that guitar strings have a shelf life even in a sealed package! I opened a package of Martin&Co Marquis, that I purchased for my wife probably about 20 years ago. She never installed them because she never actually played. Although sealed in the package inside the guitar case in air conditioning the high E and B strings had rust on them. I threw them all away of course, even if no visible rust is on the other 4 strings they can’t be much better than the rusty ones. It’s funny because the strings on the guitar are significantly older but still playable at this point.
I just ordered new strings because all the spare sets I have are for electric.