The oldest reliably drinkable wine is a white wine from 1472, stored in a 450-liter barrel in the cellars of the Hospices de Strasbourg in France. The wine has only been tasted three times throughout its history:

1576: To celebrate a Swiss alliance.

1718: After a hospital fire.

1944: To commemorate the city's liberation from Nazi occupation.

The 1576 event was perhaps the earliest example of deliveroo. As part of a major shooting tournament, a delegation from Zurich travelled by boat to deliver a cauldron of hot millet porridge to the city, to prove they could reach Strasbourg swiftly (in just 18 hours) and still keep the porridge warm. This was a diplomatic performance reinforcing the Protestant alliance and mutual support between Strasbourg and Zurich during the Reformation.

It has actually been drank at least once more, by two French oenologists in 1994:

>La verdeur du vieillard En 1994, une analyse du vin de 1472 a été réalisée par deux oenologues, MM. Lobre et Windholtz, prouvant « que c’est encore du vin » et non pas « une mixture bonne à assaisonner » une batavia. Le nez a été jugé « puissant, très fin et d’une grande complexité ». En bouche, ils ont relevé des notes de vanille, de miel, de cire, de camphre et de noisette. Alors qu’un « vin normal » possède 20 g d’extraits secs, celui des hospices strasbourgeois dépasse les 45 g ! Conclusion : « Ce vieillard a conservé une étonnante verdeur », 538 ans après sa naissance.

from https://web.archive.org/web/20131103183014/https://www.lalsa...

It seems the next time it will be tasted should be sometime in 2130.