I have eggs that are 1 month old, and eggs that are 1½ month old.. And they all look perfect/brand "new". Maybe you keep them in a too dry media, I also use Vermiculite, but I add much more water, than other folks do! And I'm absolutely sure, I'm doing the right thing.
For 100 gram Vermiculite, I use 300 gram water! And that seems just about right..
Hope your eggs will be fine
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