I've only ever had fresh Ten Fidy (because it flys off the shelves so fast, and I can't hold onto it), but last night I snatched up a 4pk that was canned on 10/07/10. How does this stuff age? I'll get a fresh 4pk to compare. As an added anecdote, I convinced the salesman that the beer had gone bad. He gave me the 4pk for $6.