It is possible... It doesn't mean the yolk is old... i think it usually comes in brown shells, I'm not sure but when my dad used to buy them they were brown shells. They're not easy to find tho
Twin chicks hatching from the same egg is not possible. They would outgrow the space inside the egg before being fully developed, causing the egg to burst and killing the chicks. But they would probably suffocate before then, an egg is only made to allow enough air in for one chick, not two.
First guest, don't be a fucking moron. The yolks are for feeding the chick and two yolks means more food for baby. All turkey eggs have two yolks and only one chick eats both. Sometimes a chicken egg will be layed with two, that doesn't mean it's old and unsafe to eat, only it has two yolks instead of one.
And give me that baked egg.