Here are some sensible views on the topic of when the texts originated:
and, Wiki, <[en.wikipedia.org];
Please note this statement from the first article: "For about sixty years now a tiny papyrus fragment of the Gospel of John has been the oldest "manuscript" of the New Testament. This manuscript (P52) has generally been dated to ca. A.D. 125. "
If you are interested, there is a picture of P52 in the second article on Wiki.