New Evidence: When Did Humanity's Last Common Male and Female Ancestors Live? explains that today's males can trace their Y chromosome back to 120,000 to 156,000 years ago.
The study by University of Sassari in Italy estimated 180,000 to 200,000 years which is not too different from the results of the Stanford Study.
Recall our mitrochondrial DNA can only come from our mother. The Stanford team estimated that our common mother lived 99,000 to 148,000 years ago.
Interesting, isn't it?