Even so, given that the biblical Methuselah is reputed to have lived until he was 969 it's possible that the film might have some historical scenes to it, and, as the reason for his deccelerated aging has not yet been given, there remains the possibility that the film might yet link up with the Bible in some way. But given all that we are told in the bible is the following passage from Genesis 5:21-27, it seems unlikely:
And Enoch lived sixty and five years, and begat Methuselah...And Methuselah lived an hundred eighty and seven years, and begat Lamech.And Methuselah lived after he begat Lamech seven hundred eighty and two years, and begat sons and daughters. And all the days of Methuselah were nine hundred sixty and nine years: and he died.For what it's worth, a literal reading of the biblical chronology suggests that he died the same year as the flood. And, of course, such a reading would also contend that he died before his father. It will be interesting to see if either of those elements are reflected in the final film.