The annunaki who created us in their image by using their own DNA mixed with some kind of native human critter placed an age limiter in our DNA so that we couldn't live long enough to gain enough knowledge to challenge our slavery to them as gold miners.
Or so the supposed translations of the Sumerian tablets tell us.
Imao, the human form is predominate in the universe, the Annunaki (reptilian hybrids) took the local humans living relatively peacefully in the worldwide Garden Of Eden and made them stupider and also placed the age limiting gene in them, so they would be obedient gold miner slaves and worked them to death.