Spolier Alert!

I heard through the grapevine today that eggs never go bad. This sounded fishy to me, so I came home on this very nice day to check it out. Here's the facts:

Eggs apparently can spoli if the shell is compromised (i.e. cracked), but it seems that they primarily just run the risk of "not being as good." It seems that the yolk becomes thinner, and the white runnier with time, but otherwise the only thing you need worry about is the egg drying up. If your eggs comes out in one solid clump, or in a powder, you should probably try getting a fresher batch. Otherwise, eat up!

From Learn More About Eggs.