Who would have thought, grandparents who are parents of the father-mother, is a new phenomenon. Human ancient times was very short-lived, did not even know of two previous generations. Based on the results of recent studies, a human ancestor about 30 thousand years ago, has a very short age range for three generations. Simply put, most people died before he could meet his granddaughter. Scientists said the new findings suggest, life span is experiencing growth, expanding population and people are starting to struggle to survive. But the emerging belief, long life span of early humans, the key factor that allows superiority of their form, compared to its competitors, namely the Neanderthals. Report of long-term research findings published Scientific American magazine this study proto-human fossils that brings us back to three million years ago. anthropologist Rachel Caspari said, through examination of Neanderthal dental records, the team of Rachel prove that 30 thousand years ago, 'no human being capable of passing the age of 30,' age at which people become grandparents. The results of this study involves the fossil remains of 768 individuals, taking into account the ratio of older adults to younger adults, in community early man thousands of years ago. In a culture Neanderthals, there were only four adults who get past the age of 30 of every 10 young adults. While the average life expectancy Neanderthals ranged in age from 15 to 30 years. However, when the researchers turned to humans from the Stone Age Europe beginning, investigators found the ratio of elderly adults and young adults is 20 to 10.
That is, now many people can live to have grandchildren. The scientists concluded, "Survival in the adult human evolution is delayed". However, until now, scientists have not been able to explain this phenomenon. However, one thing is clear, the life span brings great benefits to society of early humans. Not only increases the grandparents 'social and economic resources', the group also passed 'cultural knowledge,' such as traditional hunting techniques in the offspring. Finally, "longevity becomes a prerequisite for a unique and complex behavior that signaled modernity. This innovation ultimately promote the importance of adult survival that led to the expansion of population impact of genetic and cultural importance to the successor. " Concluded, early humans 'older and wiser' than its rival. This allows them to compete and ultimately destroy its rivals. This finding explains how the human population to recover, after a decrease of several thousand years ago. A recent study claims, the group then fills Europe and Asia amounted to only 1,200 people at one point. However, due to advances in longevity, population growth becomes faster and people can build themselves. (Here)