3. The Sentinelese Are Really Old
To be honest, this tribe would have made for a really interesting study because they have stayed away from any kind of modern-day advancement and choose instead to stick to the ways that they know best.
Having said that, some historians state that it is quite possible that this tribe is nothing less than 60,000 years old and has stayed true to the traditions and way of life that have been taught from one generation to the next. It is possible that they depend on hunting, gathering, and farming as the main forms of occupation.