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Even if it doesn't, like all spices, it'll lose flavor over time. It'll lose flavor much faster if it's pre-ground rather than stored whole. Salt, on the other hand, is a very stable chemical and won't support anything growing on it, so it won't go bad.
Just so, what is the shelf life of salt and pepper?
Properly stored, ground black pepper will generally stay at best quality for about 3 to 4 years. To maximize the shelf life of ground black pepper purchased in bulk, and to better retain flavor and potency, store in containers with tight-fitting lids.
Herein, what happens if you eat expired salt?
Many foods do deteriorate over time but salt is a mineral, not food. It will last literally forever, and nothing can live in it. The only thing that can deteriorate is the packaging. If that happens, the salt could get contaminated with some other chemical like bleach that would be bad.
According to a report by Taste of Home, ground spices lose flavour quicker than whole spices. The site added whole spices can last four years, ground spice three years, dried herbs three years, spice blends two years and fresh spices (not surprisingly) one week.