Now Noah was 600 years old when the floodwaters came upon the earth.
6. And Noah was six hundred years old . It is not without reason that he again mentions the age of Noah. For old age has this among other evils, that it renders men more indolent and morose; whence the faith of Noah was the more conspicuous, because it did not fail him in that advanced period of life.
Here is Noah's ready obedience to the commands that God gave him. Observe, 1. He went into the ark, upon notice that the flood would come after seven days, though probably as yet there appeared no visible sign of its approach, no cloud arising that threatened it, nothing done towards it, but all continued serene and clear; for, as he prepared the ark by faith...
Commenting on Genesis 7:5-10
And Noah went in, and his sons, and his wife, and his sons' wives with him, into the ark,.... Within the space of the seven days, between the command of God to go into it, and the coming of the flood; or rather on the seventh day, on which it began to rain; when he saw it was coming on, see Gen 7:11.