The form of human genus is only about 2.1 million to 1.8 million years old. It took us a couple of million years from formation to where we are today. In reality the history of human genus is relatively very short compared to the origin of our living quarters; the good earth. The best estimate of how old the earth is about 4.543 billion years. So compared to the origin of our mother earth, us human genus have been around for a very short and young existence.