Jos. Christoffel Jr, Erdener Treppchen, Riesling Spätlese, 1996, White wine from Germany
Yes you can keep white wine for decades: Many Mosel Rieslinge can be stored for years. Many of them get better.
This wine is such a classic that many people would think: “oh god, this looks like stuff my grandparents would have in their pantry: sweet German white wine which gives you a headache.