Genesis 7:6, 11-12, 24

Noah was six hundred years old when the floodwaters came on the earth.

In the six hundredth year of Noah’s life, on the seventeenth day of the second month—on that day all the springs of the great deep burst forth, and the floodgates of the heavens were opened. And rain fell on the earth forty days and forty nights.

The waters flooded the earth for a hundred and fifty days.