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Tradition rule
(leminal.space)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I mean, tradition has its place in human evolution. The elders often did knew better (btw, that's why humans have grandparents). But in the modern fast-lived world, it's vastly outdated.
Still, you should learn from the past and live in the present.
edit: though traditions in the form of customs, some of them are nice and should be preserved.
I would say that humans have grandparents due to the nature of human mating and offspring.
Yes, they can help care and give wisdom. Directly linked to why we get that old.
Edit: apparently, other primates have grandparents too.
I think people are misunderstanding your point here. This is an evolutionary advantage because it facilitates the passing of skills and knowledge. Because of that it is, like you said, directly linked to why we get old instead of, for instance, having two dozen kids and dying at 20 like rabbits might. Folks that kept grandparents stayed alive more than ones that didn't.
Thanks, you explained it better.