From the beginning of known history, we have had fully formed spoken languages and different forms of written language. There is no such thing as "pre-historic" history. There is only history, and history proves a timeline that corresponds to the deluge or Noah's flood. We see fully formed languages that spread out from the Mesopotamian valley in all directions meeting the chronology of the dispersion of tongues at the Tower of Babel. This is further evidence that the Bible is historically accurate and trustworthy in all things.
Enjoy the video blog and have a blessed week.