Besides, in chapter 6 verse 4 it says that God will limit people's ages to 120 years.  It is the same word used in chapter 6 verse 1 to describe Noah's age.  What was that verse supposed to originally mean?  Wasn't it there to explain to the readers how these people lived a LOT longer than people now were living?  That means that according to the correction for the Metonic cycle people the writer meant that people would only live to be 9.7 years old.   This verse loses its context when you use the same standards to it that you use to the other parts of Genesis.