> why don't we live indefinitely in the first place?
It doesn’t seem to be necessary for the survival of our genes.
> You would expect the reproductive benefits of a 70 year old caring for their own child might be at least comparable to 70 year old caring for a grandchild.
They’re competing with 20-30 year-olds with better physical fitness for a mate. This would be relevant for ~99% of human existence even if it’s not totally relevant today.
It doesn’t seem to be necessary for the survival of our genes.
> You would expect the reproductive benefits of a 70 year old caring for their own child might be at least comparable to 70 year old caring for a grandchild.
They’re competing with 20-30 year-olds with better physical fitness for a mate. This would be relevant for ~99% of human existence even if it’s not totally relevant today.