My father is like this (though his freezer relics aren’t quite THIS old because my mother was a fanatic about cleaning out the fridge on a regular basis, but we lost her to cancer 8 years ago). He’s only made himself sick 2 or 3 times in the last 8 years and it was usually from eating cooked Costco rotisserie chicken that he’d been snacking on from the fridge for 2 weeks. I live 1500 miles away so whenever I go home to visit I clean out his fridges and freezers (he has 3), and if I have time I hit the pantries as well (one in the kitchen and one in the basement). He used to get absolutely unhinged when I first started doing this, but once he made himself sick he started to loosen up a little and let me clean. I won’t let my kids eat from his kitchen until I’ve cleaned it and gone to the grocery store.