The mitochondrial clock is in need of recalibration.
Mitochondrial DNA appears to mutate much faster than expected, prompting new DNA forensics procedures and raising troubling questions about the dating of evolutionary events
Regardless of the cause, evolutionists are most concerned about the effect of a faster mutation rate.For example, researchers have calculated that “mitochondrial Eve”–the woman whose mtDNA wasancestral to that in all living people–lived 100,000 to 200,000 years ago in Africa. Using the newclock, she would be a mere 6000 years old
http://www.dnai.org/teacherguide/pdf/reference_romanovs.pdf