Description : How old would unopened yogurt have to be for you to consider it too old to eat?
Last Answer : My father used to keep unopened yoghurt (a national brand, the kind you're supposed to keep refrigerated) in his backpack. It never went bad. But I bought a cheap brand of yoghurt at a dollar store once and it ... it. OOoopsie! It was nasty. So open it, smell it, and if you're brave enough, try it.