Noah had not married until he was four hundred and ninety-eight years old. Then the Lord had bidden him to take a wife unto himself. He had not desired to bring children into the world, seeing that they would all have to perish in the flood, and he had only three sons, born unto him shortly before the deluge came. God had given him so small a number of offspring that he might be spared the necessity of building the ark on an overlarge scale in case they turned out to be pious. And if not, if they, too, were depraved like the rest of their generation, sorrow over their destruction would but be increased in proportion to their number.
Wanderings of Noah
Legends of the Jews 4:42