We only keep a few laying hens, but still sometimes accumulate a lot of eggs in the fridge. To make sure we always use the oldest first my wife uses a felt tip marker to write the day of the month on each egg. You do get strange looks the first time people see it. When I gave some eggs to the preacher's wife I told her we used them in our illegal numbers gambling ring. I told another lady in church we used them for our illegal bingo games on Sat night and the preacher had got all the letters, she got all numbers in case they wanted to hook up & start their own game.