>> genes only propagate if selected for, and there’s no selective pressure for longevity after reproductive age Because humans are not social animals? Because

>> genes only propagate if selected for, and there’s no selective pressure for longevity after reproductive age Because humans are not social animals? Because protecting your own offspring as long as possible is NOT a thing? Everything with even slight benefit is selected for to a degree based on that benefit. Having parents is beneficial. Having grand parents is probably also useful. Having great grandparents... well someone has to get eaten by that lion.