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I recently encountered a beer that was utterly rank and had an awful aroma. I tasted a small sip, but had to toss the rest. Investigating the label on this beer, I discovered it had an expiry date of Dec. 2012, making it just over one year old.
This beer's alcohol content was 5.6% ABV, and it clearly did not have a lengthy self life.
Contrastingly, a local brewer annually brews an ice bock with an alcohol content of 9.5% ABV, and they state that because of this high alcohol content, it's suitable for aging (and it ages well, to boot).
What is the minimum alcohol content/ABV percentage required in order to consider a beer safe/suitable for aging? If pasteurization plays a role, please advise.