Well, so far we know that Y-chromosomal Adam (Y-MRCA), the most recent common ancestor from whom all currently living people are descended patrilineally, lived 237,000 to 581,000 years ago, and that Mitochondrial Eve, the matrilineal most recent common ancestor of all currently living people, lived approximately 200,000 years ago.
Of course, science (sorry, the consensus of the scientific community at this time) says “there is no reason why Mitochondrial Eve and Y-chromosomal Adam should necessarily have lived at the same time” and that “the bearer of the chromosomes were not the only human male and female alive during his time, but their male and female contemporaries failed to produce a direct unbroken male and female line to any living human in the present day”. Of course, that hypothesis is just the fruit of someone’s imagination in line with evolutionism, and as far as we know it is also a perfectly valid hypothesis that they may actually have been the only male and female and have lived together.
It is sententia certa that the whole human race stems from one single human pair: meaning it is a theologically certain judgment, part of infallible ordinary magisterium. We assume science will eventually show this to be the way things happened. Maybe when it ceases to be under the heel of atheism.