I am not sure we are understanding each other, so let me summarize.
Firstly, the core of the theory is that grandparents were able to pass on their wisdom and knowledge to future generations, thereby contributing to our species advancement. These contributions would have ranged from medicinal or survival skills and judgments that take a long time to master. If you want to know how the evolution would take this into account, I can hypothesize that since long life has a strong genetic factor to it, clans that had long living members in them survived better than those who did not. This is how and why humans live so long, especially past the reproductive age.
The second argument there was that as the population is choosing to have kids later in life today, and because men fathering children in later years have much greater mutations in their sperms, the nature of evolution itself maybe changing.
Side note - evidence, going back to before neolithic age shows that humans were unique in caring for their elderly (and believing in god/afterlife). Such evidence includes (but not limited to) survival of old members who did not have teeth. Which means someone must have chewed the food for the elderly and fed them (another side note, some have theorized this is the origin of kissing). |
