Good grief, do people not know that the letters were written while Paul was in jail near the END of his life and ministry?
I don’t see anywhere, except for maybe, possibly by a stretch Luke’s writings, that anyone said that they had the idea of writing these things down for posterity, and Luke’s intent was just to inform Theophilus of what was really pretty much widely known.
They seem to forget that it is GOD'S TIMING ACCORDING TO HIS PURPOSES that the Scriptures are inspired by Him.
If it was written in 67 A.D. that's when it was inspired by God to Paul to be written.
Just another important point overlooked by those who scrap the word of God for doctrines of men.