3 Signs Your Eggs Are Past Their Prime Sometimes, the contents of our fridges get neglected. It’s cool, we do it too! (With four fridges in the test kitchen, it’s very easy for things to go unnoticed a little too long.) Next thing you know, you’re about to make yourself an omelet and you think to yourself, “How long ago did I buy these eggs?” Unlike milk and bread, it’s a little difficult to tell whether eggs are past their prime or not.