I'm not saying they weren't written in the first century. I'm saying that the earliest copies of these texts don't themselves date to the first century.
And I don't think we have any of the originals.
I would love to be convinced otherwise.
Oh, ok. I misunderstood what you were saying. You are absolutely right. The earliest copy is actually a fragment of the Gospel of John that dates to the 2nd or 3rd century and no actual original exists. But, that is also true of all ancient literature.