The Rabbis debate over the ages in Genesis 5 regarding whether or not the long lives were attributed to all humans prior to the flood, or if they pointed to the remarkable ages of the lineage from Adam to Noah.
There is reason for this. They look here:
Pharaoh asked him, “How old are you?”
And Jacob said to Pharaoh, “The years of my pilgrimage are a hundred and thirty. My years have been few and difficult, and they do not equal the years of the pilgrimage of my fathers.”
Genesis 47:8-9 (NIV)