A few weeks ago I mentioned how the average grocery store egg might be 45 days old (or more) by the time you buy it. A few people asked for proof (beyond the LAW which states that a farmer has 30 days to carton and egg and then another 30 days to sell that egg after it's been cartoned).
So today (1/19) I was shopping and snapped a few photos of some egg cartons. EVERY date I saw on them was between 352-355, meaning that those eggs were put in that carton on the 352nd-355th day of last year. Add to that the 19 days so far this year, and these eggs have all been in the carton for about a month (and could have been laid up to 30 days prior to that) and check out the Sell by dates - these eggs can still sit on the shelf for a few more weeks.
Just be aware of the food you're buying. Know how to read labels. And keep raising those backyard chickens! I'll take a 45 MINUTE old egg from a happy hen any day over a 45 DAY old egg!