Technically, chemical safety rules mean that a properly sealed, high-ABV, and uniquely brewed vintage beer stored in optimal dark, temperature-controlled conditions may not contain toxic pathogens, but it is almost certainly undrinkable from a culinary perspective. Over a century, oxidation, yeast autolysis, and bacterial micro-leaks transform the liquid into an unpleasant concoction tasting heavily of cardboard, sherry vinegar, soy sauce, or cardboard decay, rendering it a historical artifact rather than a pleasant beverage.