I was reading The Wayfinders (2009) by Wade Davis … and was captivated by his story of an African DNA study which concluded the San are likely to be the oldest population of humans on Earth.
The San, also known as bushmen, are directly descended from the original population of early human ancestors who gave rise to all other groups of Africans and, eventually, to the people who left the continent to populate other parts of the world.
This Wade Davis book argues that ancient wisdom still matters in the modern world. And that humanity will be lesser if we lose cultures like the San.
For some reason(s) a small group of San migrated north about 350 generations ago. Most people in the world are likely descended from that intrepid group. Some of the San still live much like they did 350 generations ago.