Life Term Reduction in Genetic Makeup

I am a believer that we were at one point seeded by an unknown race and ultimately genetically limited in terms of life span, brainpower etc.

Let's say for a second that we were seeded by Annunaki or whomever they were for the purpose of mining gold. If were were genetically evolved into what they were/are from a sub form of being, what reasons would they have to limit our lifespans?

I'm no mathematician, but I would be curious to find out how much larger our population would be today if we had an average life span of say 500 years. And with that, how many other resources would be depleted by now.

What is the oldest human skeleton found to date?

I guess what I'm getting at is, if we were genetically limited in terms of our span of life, it would make sense in that if a race of being were only able to be here for a limited time every 3,600 years but used this planet to mine or gather resources needed that possibly only this planet can provide, you would want to make sure that the beings you created didn't deplete everything or otherwise damage the planet before you were able to come back. Longer life means more people, more people means less resources.

I am preparing a new blog called fixourgenes where I intend to question many in the field of genetics, radio interviews, lots of research and the like to better educate myself while sharing my findings with the public.

I genuinely think there is something to the fact that people in the bible lived hundreds of years yet we cough and die at 80 if we are lucky. I personally would like to get to the bottom of this and thought I would first begin by starting this thread in hopes that others on this forum might lead/link me to other resources online that I could begin my research, people I should consider talking to etc.

Thank you all.