>There is no indication that humans face selective pressure to die early. While I do agree that pea plants are different, human grandparents may help in child

>There is no indication that humans face selective pressure to die early. While I do agree that pea plants are different, human grandparents may help in child rearing, but they may also consume time and energy for care. We're social animals that would not kill our own grandparents for having more food/time available. But nature might find it's useful for procreation if they don't live too long. Elderly care is a huge time/energy sink. And longevity makes the input/output unfavorable in a lot of cases. If you're in an environment like our ancestors where food was most of the time scarce, then that adds weight to this equation.