"Serennah Harding, will be the youngest female doctor in the U.S. on May 19, 2013. She will be graduating from Philadelphia College of Osteopathic Medicine (Georgia Campus) and will be pinning on the rank of Lieutenant as a Navy resident DO at the age of 22. She was homeschooled until she started college at the age of 12!" source
Serennah also comes from a large family.