Wrinkles and spots on yolk

[Vanilla2]

This eggs i just bought them from shop, one of them have wrinkles and other one have some spots like the moon .
What is there?

 

[Wyorp Rock]

The egg looks to be fairly old, the darker spots and wrinkles indicate that.

 

[aart]

The egg looks to be fairly old, the darker spots and wrinkles indicate that.

As well as the size of the shadow around the blasto-disc.