Yes Prosecco can go off, but it doens't mean you can't have fun with it. The reason is most Prosecco is meant to be drunk young while its fresh and fruity. Over time, it can get kind of bitter and nutty because its not really a wine that's meant to age. read more
Prosecco is filtered and bottled under pressure, labeled and shipped with the intention of consumption within months. It can easily go off if exposed to extremes of heat, humidity and light. If the wine is yellow or brownish yellow it has probably maderized from exposure to heat. read more
Wine does not go off - at least not until it's old enough to be saleable as an antique. Some even improves with age - a lot of red wine is much better when it's a few years old. Alcohol is an antiseptic so it's its own preservative! The key thing is whether air has got into the bottle. If it has a screw cap, this won't be a problem. read more
Eventually, yes. Certain champagnes, as detailed below, can last beyond 20 years. The shelf life of champagne depends on a variety of factors, such as the label and how the champagne was stored. read more