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There was no first. People slowly evolved from other hominids and it is completely arbitrary where you draw the line. It doesn't start at one generation or even a hundred generations. The first birth was about 100 million years ago by our primitive ancestor that was the first placental mammal. Even that wasn't a single individual as it no doubt took millions of years for the placental mammals to evolve. The first anatomically human fossils are about 200,000 years old. They weren't quite modern human though they fall in the range of modern humans. Some anthropologists extend Homo sapiens back about 500,000 years.