There are a number of evidences that the human race is very young. For example, in an article in Science1, the age of the human race is is estimated to be 1,000 to 10,000 generations: "...1000 to 10,000 generations old, which is roughly the age of the human population,..."
We review some evidence for the youth of the human race, including recent findings concerning mitochondrial DNA mutation rates that give even a much younger age than 1,000 generations.
Age estimates are obtained by observing differences between the DNA of different individuals and are calculated using estimates of mutation rates. Mitochondrial DNA is often used for this; it is separate from the bulk of the human DNA, which is found in the cell nucleus. Mitochondrial DNA has about 16,000 base pairs and mutates, apparently, much faster than the nuclear DNA. Human mitochondrial DNA has been completely mapped, and all the coding regions are known, and the proteins or RNA for which they code. Some of the mitochondrial DNA does not code for anything and is known as a control region. This region appears to mutate faster than any other region, because the variation among humans is greatest here.