@nixCraft I'm reminded of something I read about happening in a pharmacy that had been running for quite a few years.
They found a box of a mixture of various medicines that hadn't been touched for forty years. They were about to throw them out, when someone bright who knew about such things grabbed them and sent them off to test their potency (for science!).
Almost everything was still good.
Expiration dates are testing-based and they just don't test a drug for forty years before release.