We watched "The man from earth" yesterday (imdb link), a low budget, dialog based movie with a brilliant storyline.
An "Upper Paleolithic" man has by a freak of nature survived until modern times. The story touches on what he would've seen and learned etc.
From imdb: "An impromptu goodbye party for Professor John Oldman becomes a mysterious interrogation after the retiring scholar reveals to his colleagues he is an immortal who has walked the earth for 14,000 years. Acclaimed Sci-Fi writer Jerome Bixby conceived this story back in the early 1960's. It would come to be his last great work, finally completing it on his deathbed in April of 1998."
I really like the story. 14 000 years is a long time, a lot of things have happened... It's a shame it was such a low budget production with rather poor acting work by some (some more than others) and to make things worse the sound was quite bad in the copy we watched, but it was still worth watching! :-)
The theme brought my thoughts to the film K-Pax, which had a few more dollars poured into it, but has the same base structure. :-)