After the waters of the flood subsided, Noah, his family, and the animals came off the boat to begin Age Four.
"All flesh that had been moving on the earth had deceased, of the flyer, of the domestic beast, of the wild animal, of every swarming thing swarming on the earth, and every human." (Genesis 7:21)
God promised Noah He would never again destroy the earth by a flood of water, even though the heart of humanity would continue to be evil. Rainbows are a reminder of that promise.
"Yahweh Elohim said in His heart: Not anymore will I maledict again the ground on account of humanity, for the bent of the human heart is evil from its youth. And not anymore will I smite again every living flesh, just as I have done. In the future, for all the days of the earth, seedtime and harvest, cold and warmth, summer and winter, day and night, they shall not cease." (Genesis 8:21-22)
"My rainbow have I set in the a cloud, and it will be for a sign of the covenant between Me and the earth." (Genesis 9:13)
The three sons of Noah on the boat with him are named Ham, Shem and Japheth.
"...the sons of Noah who came forth from the ark were Shem, Ham and Japheth...These three were Noah's sons, and from these the entire earth became inhabited." (Genesis 9:18-19)
God told Noah and his sons to fill the earth. Instead they stayed in the area where the Ark came to rest. Eventually a man named Nimrod built the first cities and started the first government and religion of humanity in the city known as Babel. Humanity began to build a great tower into heaven instead of spreading over the Earth. So God forced them to spread over the earth by confusing their language.
"And saying is Yahweh, "Behold! One people is it. And one language is for them all. And this they started to . do! And now nothing will be defended from them of all that they will plan to do. Therefore, We will descend and there disintegrate their language, that they may not hear each man the language of his associate. And scattering them is Yahweh thence on the surface of the entire earth. And lthey stopped building the city and the tower. Therefore its name is called Babel, for there Yahweh changed the language of the entire earth. And thereafter Yahweh Elohim distributed them over the surface of the entire Earth." (Genesis 11:6-9)
The distribution of the land began in the days of a man named Peleg.
"And to Eber two sons are born. The name of one is Peleg, for in his days the land was distributed." (Genesis 10:25; 1 Chronicles 1:19)
"From one human He made every nation of humanity, that they should inhabit the whole earth; and He determined their appointed times and the boundaries of their lands." (Acts 17:26)
The judgment from God upon Babel and the spreading of humans over the earth according to their separate languages ended Age Four