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Given the background description of some cooking related query, summarize the question into a title

I got some beef this weekend with the following label. This label is obviously not aimed at the consumer, but as I was after a single piece, the guy behind the counter gave it to me in its original packaging. When I got home I noticed the details of the label which opens a whole raft of questions:I'm guessing USE AFTER instruction is to ensure the meat is sufficiently mature before being sold, is that correct? If that's true, is the whole aging process done in these vacuum-pack bags? If so, could I have kept it for a further 19 days before opening (I bought it on the 5th) for a more mature beef? Who needs "Jamie Oliver Matured for 21 days" if we can just do it ourselves? PURCHASED: 5th, USE BY (on sale label): 6th
Output:
Is beef 'aged' in vacuum packed bags?