It's not the salt that expires but the plastic. After some time the components of the plastic will deteriorate and create a risk for the consumer. And also geekoverlord is correct.
Sorta. It's a "best before" date, not an actual expiration date. Salt when stored in an air tight container in a cool dark place will last pretty indefinitely. When exposed to moisture or other things it can break down or become unpleasant. You can technically reclaim salt after this has happened, but will likely lose any added iodine etc. So the best before date is really just an estimate of how long the average person using reasonable storage practices has before the salt begins to alter from freshly processed at the factory.
IT IS NOT THE SALT DUMBASS. IT IS THE CONTAINER. KEEP IT IN A GLASS JAR OR SOMETHING SIMILAR AND IT WOULD BE GOOD FOR THE NEXT 250 MILLION YEARS, IF PRESERVED PROPERLY.
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