Ha ha! Well, I’ve only lived here four years, so I can’t top any of those, but my mother’s fridge and pantry are a treasure trove of ancient things. She regards use by dates as a challenge rather than a suggestion. Last time I was there I surreptitiously threw away mayonnaise ( use by March 2014, and not kept in the fridge,) pickled onions, 2013, ditto) and various unidentifiable leftovers in dishes. The real find was a tin of golden syrup which didn’t even have a best before date, and had gone rusty on the bottom and had its lid welded by a thick crust of black goo. I think it had accompanied her on at least three house moves.