When it comes to the longevity of beer, it's important to consider the packaging. Generally, beer can last for six to nine months after the date printed on the label. However, this can vary depending on whether it is in cans or bottles.
Cans tend to offer better protection against light and oxygen, which are two factors that can negatively impact the quality and taste of beer. Light can cause a process called skunking, where the beer develops a foul smell and taste. Oxygen can also lead to oxidation, which can result in a stale or cardboard-like flavor.
In my personal experience as a brewer, I have found that beer stored in cans tends to have a longer shelf life. The aluminum material provides a better barrier against light and oxygen compared to glass bottles. Additionally, cans are typically sealed more tightly, reducing the chances of oxygen exposure.
When it comes to bottles, the type of glass used can make a difference. Darker bottles, such as amber or brown, offer better protection against light compared to clear bottles. This is because darker glass helps to filter out harmful UV rays that can degrade the beer. As a result, beer stored in dark bottles may have a slightly longer lifespan compared to those in clear bottles.
However, it's important to note that even with proper packaging, beer will still lose some of its qualities over time. It may become flat, lose its carbonation, and the foam may dissipate. Nevertheless, these beers are still drinkable, although they may not have the same fresh and vibrant characteristics as when they were first packaged.
To summarize the answer to the question, beer generally lasts longer in cans compared to bottles. Cans provide better protection against light and oxygen, ensuring the beer retains its quality for a longer period. Darker glass bottles also offer some level of protection, but not as effective as cans. Ultimately, it's essential to consume beer within the recommended timeframe indicated on the label to enjoy it at its best.