Sherry is a wine, albeit a fortified one, that does spoil after a certain time being open. ... Amontillado and Medium Sweet Sherries in a sealed bottle will last for 18 to 36 months. If the bottle is open they will last 2 -3 weeks. Oloroso and Cream Sherries in a sealed bottle will last for 24 to 36 months.

How do I know if my sherry is bad?

Okay, let's get back to the main question of whether sherry can go bad or not. Well, if you store it well, it won't spoil in a way that drinking it is unsafe. But if it sits around for too long, its taste will flatten and become somewhat stale. And if that happens, it's time to discard the bottle.

Can old sherry make you ill?

Can drinking an old wine such as Port literally make you sick? ... Well, you certainly can get ill if you drink too much Port—or too much of anything, for that matter. Overindulging will almost always lead to unpleasant symptoms. But it sounds like you're wondering if a wine spoils as it gets older, and the answer is no.