My girlfriend's family cabin has a cold storage in the basement. We found some canned stew that had expired in 1982. A friend of mine actually ate it and he didn't get sick!
My father was an academic and the thing academics do when they visit each other's houses is to bring a bottle of something. So they had a cellar room full of booze. It was awesome when I was in high school in the mid-90s. My parents didn't drink beer though, so there was no beer in the house except for a six-pack of Michelob at the back of the room that had pull tabs on it. They stopped making pull tabs in 1980. So it was at least 14-year-old beer. It was one of the few things I didn't think about and/or decide to steal.