As an expert sommelier and brewer, I can confidently say that drinking old beer is generally safe, although the taste may not be as enjoyable as when the beer was fresh. Craft beer, in particular, is made with natural ingredients such as hops, malt, and yeast, which are living organisms that naturally degrade over time.
When beer ages, it can develop off-flavors and aromas. This is due to a variety of factors, including the breakdown of hop compounds, oxidation, and the growth of bacteria or wild yeast. These factors can lead to a beer tasting stale, cardboard-like, or even sour.
However, not all beers will age the same way. Some beer styles, such as imperial stouts or barleywines, are known for their ability to improve with age. These beers often have higher alcohol content and a stronger malt backbone, which can help preserve their flavors and allow them to develop new complexities over time. It's worth noting that aging beer is a personal preference, and not all beer styles are suitable for aging.
When it comes to expired beer, it's best to trust your taste buds. If you open a bottle or can of beer and immediately detect off-flavors or aromas, it's probably best to pour it out. However, if the beer still tastes pleasant and doesn't exhibit any signs of spoilage, it should be safe to consume.
It's important to note that the expiration date on a beer bottle or can is not an exact science. It's more of a guideline for when the beer is likely to be at its best quality. Some beers may still be enjoyable beyond their expiration date, while others may start to deteriorate before that date. Therefore, it's always a good idea to check for signs of spoilage before consuming expired beer.
In my personal experience, I have come across both pleasant surprises and disappointments when drinking old beer. I have had the pleasure of trying aged barleywines that have developed rich, sherry-like flavors over time. On the other hand, I have also encountered beers that have turned vinegary or developed an unpleasant “wet cardboard” taste.
While it is generally safe to drink expired beer, it's important to trust your senses and be aware of any off-flavors or aromas that may indicate spoilage. Craft beer, with its natural ingredients and living organisms, will naturally degrade over time, so it's best to consume it while it's fresh for the best taste experience.