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The easiest way is to put it in a glass of water. If the egg sinks, it is very fresh. If it stays submerged , but with the wide end up, it is older, but still perfectly edible. If your egg floats, it should be tossed.
Oddly enough, this question from yesterday covers issues regarding this. The ultimate test: crack the egg into a bowl (by itself, not with your other ingredients), check visually and by smell. Bad eggs smell terrible. Really fresh eggs have a raised yolk and the white mostly sticks together. As eggs get older, the yolk doesn't sit as high, and the white seeps away from the edges -- but still good for many uses.