Your eggs need to be as fresh as possible if you want fried or poached eggs. For boiled eggs that you wish to peel, it is best to use eggs that are about a week old as the shell and skin are really difficult to peel off on fresh eggs. ….
If you are scrambling your eggs or making an omelette, eggs can be up to a week old. For baked dishes, eggs can be older than a week. If you want to separate the yolks and the whites to make meringues, eggs are best a few days old as the whites whisk up better if not too fresh.