Second line of "The Memory Police"

Part of the second line of this book is: "あなたが生まれるずっと共、" which I have seen translated as "Long ago, before you were born,". Is this a literal translation, and if not, what would the literal translation be? I know the dictionary definitions of ずっと and 共, but I do not understand how they affect あなたが生まれる.

I do not know where it comes from, but just looking at this clause “あなたが生まれるずっと共,”
I have a feeling it should be あなたが生まれるずっと前

Then yes, it means “long before you were born,” so what you have is a correct translation.

The line in Yoko Ogawa's novel is "あなたが生まれるずっと昔". It's 昔 (mukashi) instead of 共.

Grammatically, I think it's supposed to be "あなたが生まれるよりもずっと昔" but it's natural enough as a colloquial quote by the protagonist's mother. We kind of commonly say it that way.

Uto-san, thank you, i just “guessed” without knowing the original lyrics! :)

AK-san, you're welcome. Google tells me that "The Memory Police" is not a song but the English title of the Booker Prize nominated novel 密やかな結晶. I noticed that a 試し読み of the first pages are available on-line.