Ktchn believes that expired beer is a bit of myth. Basically, it's completely harmless, non-toxic, and totally fine to drink. The only problem is that it might not taste so good, and it's likely to smell odd and taste stale or flat. The Washington Post agrees, noting that this decrease in taste usually comes down to three factors: hops, light, and oxygen.
To prolong the shelf life of your beer, Ktchn recommends storing it in a dark place and out of direct sunlight. 52 Brews also suggests storing beer upright at the right temperature. While the ideal temperature changes based on the type of beer, standard beers, such as IPAs or stouts, are usually safely stored at 50 to 54F (10 to 12C), while lighter beers such as pilsners and lagers should be stored a bit cooler.
52 Brews also point out that it may also be worth investing in cans instead of bottles as they are likely to last longer. "Unlike bottled beer, canned beer is airtight," brewer Josh Counsil told 52 Brews. "Nothing kills the flavor of a beer easier than oxidation."
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