Perhaps the original Man From Earth...?
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The Man from Earth is a 2007 American drama science fiction film written by Jerome Bixby and directed by Richard Schenkman. It stars David Lee Smith as John Oldman, the protagonist. The screenplay was conceived by Jerome Bixby in the early 1960s and completed on his deathbed in April 1998.
The plot focuses on John Oldman, a departing university professor, who claims to be a Cro-magnon (or Magdalenian caveman) who has secretely survived for more than 14,000 years. After he unexpectedly resigns from the University, his startled colleagues impulsively invite themselves to his home, pressing him for an explanation. But they're shocked to hear his reason for premature retirement: John claims he must move on because he is immortal, and cannot stay in one place for more than ten years without his secret being discovered. Tempers rise and emotions flow as John's fellow professors attempt to poke holes in his story, but it soon becomes clear that his tale is as impossible to disprove as it is to verify. What starts out as a friendly gathering soon builds to an unexpected and shattering climax.