Can You Drink Expired Beer?

Hop-forward styles such as India pale ales tend to lose their flavors the fastest, after about 3 to 6 months, since the compounds responsible for hop flavor and aroma are very volatile. Beer that is exposed to excessive light for a long period of time can develop "skunky" flavors. There are some exceptions to the rule that beers do not improve with age, however; high-gravity, dark beers, such as barley wines and some stouts and porters tend to improve with time at cellar temperatures.