There were several other genetic females living at the time of the person who carried the mtDNA ancestor of us all, and several other genetic males living at the same time as the genetic male who carried the Y chromosome ancestor of modern genetic males.
the person who carried the ancestral Y chromosome is predicted to live about the same time as the person who carried the ancestral mtDNA (120,000-156,000 years ago for the Y lineage versus 99,000-148,000 years ago for the mtDNA lineage)