What's the oldest but still drinkable beer you have consumed? I've just finished a bottle of Proper Job that I found in my overspill beer crate in the back bedroom. Normally I try to drink the oldest beers in stock so they don't get out of date, but somehow this and a couple of other PJ's got missed. It's best by date was November 2015!
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Not one to be easily deterred, I decided to drink it anyway. When opened, it was extremely gassy, the equal of a any keg lager, and even though poured very slowly it had a head like an ice cream cone. I left the last half an inch in the bottle as there was a lot of solids in it. I was bracing myself, expecting it to be foul - but surprisingly it was still drinkable. Not the best Proper Job I've ever tasted by a long way, but it wasn't actually bad at all, which considering it was brewed in 2014 is a good result! The hop flavour was noticeably attenuated, much less prominent than normal. I bet the alcohol content was well above the official 5%, if the amount of gas is anything to go by. Clearly quite a bit of secondary fermentation took place during the last six years.!