First lady Michelle Obama, who turns 50 this year, has accomplished much in her lifetime: She earned degrees from Princeton University and Harvard Law School before going on to work for a Chicago law firm. She later entered academia and public service. Obama, who will celebrate her birthday Friday, January 17, grew up on the South Side of Chicago as the daughter of a homemaker and a utility company employee. And she is not the only one to turn the big 5-0. Here are 50 others who are marking that milestone.