Check out this link from Organic Authorityt hat helps you tell how fresh your eggs are. Too bad you can’t do this BEFORE you buy!
http://www.organicauthority.com/foodie-buzz/how-do-you-know-if-your-eggs-have-gone-bad.html
My thought on ‘old’ eggs: put them in your hair. I put eggs in my hair about 4 times in January and saw major improvements in shine and thickness.
Waste not, want not