Champagne will last longer if it remains unopened. ... Unopened champagne will last: Three to four years if it is non-vintage; Five to ten years if it is a vintage.

Is 20 year old champagne drinkable?

Unfortunately, Champagne does eventually go bad even if you have kept it unopened in the refrigerator (or in a cool and dry place). But, it will take a number of years before this happens. This doesn't mean it's no longer safe to drink, it just means that it will lose its lovely bubblies.

Can old champagne make you sick?

Old champagne (or any sparkling wine for that matter) will not make you sick (unless of course, you overindulge). ... If it looks unpleasant, smells unpleasant, and a few small drops on your tongue taste unpleasant, then yes, the wine has gone bad but won't make you sick.