This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

70 years.

Psalm 90:10 View context

The days of our years [are] threescore years and ten; and if by reason of strength [they be] fourscore years, yet [is] their strength labour and sorrow; for it is soon cut off, and we fly away.

120 years.

Genesis 6:3 View context

And the LORD said, My spirit shall not always strive with man, for that he also [is] flesh: yet his days shall be an hundred and twenty years.