Yet, like any mortal creatures, they were getting older, and dying in battles, too. Maybe, they were familiar with life prolongation biotechnologies.
Known since the times of Beros is the Sumerian King List listing all their dynasties. Apollodorus of Athens, who lived in II century B.C., mentioned ten Anunnaki gods reigned over Sumerian state in those ancient times, and their reign was for 432 thousand years!
The Book of Dzyan also reported about immortal Celestial aliens:
«Dzyni came and saw Dzyani from the pale Father-Mother; From the white areas They came From Immortal mortals places»
The phrase «from Immortal mortals places» also focuses on the places inhabited by species, who somehow managed to understand how to make their mortal lives virtual endless!
There is a story in the Old Testament about the God’s concerns regarding the possibility for Adam and Eve to understand the secret of long living, and, therefore living forever:
«Then the Lord God said, «Behold, the man has become like one of us in knowing good and evil. Now, lest he reach out his hand rand take also of the tree of life and eat, and live forever»
Book of Genesis, 3:22.
(Does not «one of us» literally means there were several gods, not one?)
«Therefore the Lord God sent him [i.e. Adam] out from the garden of Eden to work the ground from which he was taken. He drove out the man, and at the east of the garden of Eden he placed the tcherubim and a flaming sword that turned every way to guard the way to the tree of life».
Book of Genesis, 2:23–24
Sumerian texts tell about King Marduk, the son of Enki, who killed one of high-ranked Anunnaki Celestials in a battle, and was sentenced to die in pain for that. He was bricked inside a pyramid to die of hunger. However, Anunnaki took him out of the stone cage inside the pyramid after sometime, almost dying, just to expel him to wander for 1000 years.
Also worth mentioning is the Secret Teaching of Hermes, where he in some discloses the mystery of Elohims the Celestials, proclaiming the Great Truth, that
«Humans are mortal Gods Gods are immortal humans»
Fortunate is the one who understands those words, for by understanding them, he obtains the key for everything.
The abovementioned facts deserve very thorough consideration, because Sumerian scientists were good mathematicians, they were able to calculate upcoming eclipses of the Sun and the Moon, with tenth part of a second accuracy! It is hard to believe they might miscalculate years.
It is further worth mentioning that immortal cells in a human body are already found. The bad news is up to now those are cancer cells only. Many cytological laboratories in the World now make experiments with cancer cells of a woman, who died in the beginning of the previous century. Regardless the decades passed, the cells are still as young as those in a newly born baby, time is nothing for them because they count no age! Known for now are several thousand immortal cell strains, obtained from malign tumors of humans and animals. Although nature made only malign cells immortal, there is still a theoretical possibility to turn bad into good. That means using genetic engineering methods to try to influence natural aging mechanism. By the way, such research in no way compromises Biblical statements, which say, that future people may have the immortality, which they wish so much. It would be nice, if it were the matter of not too remote future.
Having obtained a longer life, the human civilization may face the problem of free living space, which may be solved by colonizing other places in our Universe.