Have you heard of the Grandmother Hypothesis? According to the theory, grandmothers have played an essential role in helping increase human longevity. How? Because they were able to take care of their offsprings’ growing kids while the mothers cared for the younger children. This system of productivity or what we call an extended family provided an evolutionary advantage to humans. Basically, you should call and thank your granny for their essential role in evolution and life expectancy. How cool huh? I like this hypothesis because it speaks to the importance of old folk.