Question: do tapped kegs go bad?
Answer: A good rule of thumb is that the shelf life for a keg of pasteurized beer is about 90-120 days (or 3-4 months), and unpasteurized draft beer will last about 45-60 days (or 6-8 weeks) when stored at the proper temperature. ... If the beer in your keg is passed its expiration date, then we wouldn't recommend drinking it.