Noah

“I am confused about some of the numbers found in Genesis 5-7. What exactly does the 120 years refer to in Genesis 6:3? I’ve heard some say that it refers to the limit of one’s lifespan on Earth, but that can’t be true because people lived longer than 120 years after the Flood. I also don’t understand how, as some have concluded, it could refer to there only being 120 years left before God flooded the Earth. That seems impossible since Noah was 500+ years old when he learned about the Flood (Genesis 5:32-6:13), and the Flood occurred when he was 600 (Genesis 7:6). It seems that either the 120 years does not refer to the time just before the Flood or the “120 years” should have been “100 years” (otherwise the Flood would have come in the 620th year of Noah and not the 600th year). Can you help explain this conundrum?”