You buy a bottle of sparkling wine for New Year’s Eve, then never end up drinking it. A year or two later, is it still good to drink? And should you have been storing it a different way? Here’s a little guide to maintaining sparkling white wine: How long does sparkling wine keep? Sparkling wine is typically sold at the optimum ripening point since it only has a limited shelf life. Natural ageing processes change the aroma and flavour, while carbon dioxide is also lost. Sparkling wine should therefore only be stored for a few months to a maximum of three years. And after opening? An opened bott…