Anthony on Yahoo! News
In our guide to alcohol expiration, Anthony Caporale, Director of Spirits Education at the Institute of Culinary Education, said that if beer is refrigerated and unopened it can last for several years, but this will depend on style of the beer and its ABV. If you don’t finish a beer, he recommends using it for cooking.
https://news.yahoo.com/stop-ruining-beer-doing-one-170400240.html