Adam and Eve studies (Introduction)
The X chromosome has been studied into the past for the last common female and now for the male Y chromosome. The age is about the same:-http://www.sciencedaily.com/releases/2013/08/130801142148.htm-Puts the Garden of Eden back awhile ago:-"And, it agrees reasonably well with previous findings about our female most recent common ancestor, made by studying DNA carried down through the human race's female line. Such studies used DNA from mitochrondria -- structures inside cells -- and placed that time of the most recent common ancestor between 99,000 and 148,000 years ago."
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