Did you ever notice that older people tend to be conservative and against the newer trends? Same people are often in power, having spent a life to get to their

Did you ever notice that older people tend to be conservative and against the newer trends? Same people are often in power, having spent a life to get to their high position. If not for the fact that they have to inevitably die at some point, being replaced by younger people with less conservative views, they would be able to propagate their state of society indefinitely. Imagine if jim crow era politicians were still around, would they allow a black president to be elected? Short life span is generally a boon for species as it improves adaptability. Taken to the extreme, bacterias evolve and adapt to everything precisely because new generations replace the old ones. Increase the lifespan of the humans in charge, and you get a total social stagnation, because all places at the top are occupied and you can't wait for the current occupants to free them by dying.