The Aessir started to have children with humans (or homo sapiens).
In the Bible, specifically in the book of Genesis, there is a reference to a decrease in lifespan after the Great Flood.
The Humans saw the presence of a distinguishing mark on Eve when the Ishshah (Hybrid) became pregnant, and delivered the presence of the distinguishing mark on Cain and said, I have gotten a human servant from YHWH.
In the beginning, the Elohiym created new conditions in the atmosphere of the earth, the earth was without form, and void and darkness were upon the surface.
And the YHWH Elohiym established an enclosed garden eastward in Eden, and there they put the humans.
The Genesis Apocryphon (1Q20), also called the Tales of the Patriarchs or the Apocalypse of Lamech is one of the original seven Dead Sea Scrolls.
And Enlil plagued Pharaoh and his house with great plagues because of Sarai Abram’s wife.
And the whole earth was of one language, and of one speech.
Let us go down, and there confound their language, that they may not understand one another’s speech.
Now these are the generations of the sons of Noah, Shem, Ham, and Japheth: and unto them were sons born after the flood.
But flesh with the life thereof, which is the blood thereof, shall ye not eat
Anu remembered Noah, and every living thing, and all the cattle that was with him in the ark.
And Enlil said unto Noah, Come thou you and all thy your house into the ark; for thee you have I seen righteous before me in this generation bloodline.
My spirit appearance shall not always strive with altered humans, for that he also is flesh: yet his days shall be limited to 120 years.