I decided I needed to back up all my jabber about the oldest men's vitamins in the cupboard that I mentioned the other day, and I went to look at the bottle for an expiration date. Alas, there are no vitamins at all in our cupboard now that I ran out. Apparently he ran out a while ago and never said anything. I'm not sure if that's good or bad, but there it is.
Of course it also doesn't answer my initial concern about whether vitamins expire. I imagine they would, but what happens then?