Nadia Comaneci
Nadia Comaneci was only 15-years-old when she entered the Olympic Games in Montreal back in 1976 for Romania. She earned five medals that year and earned the Olympics' first-ever perfect 10. In 1980, she left Romania to marry former Olympic gold medal gymnast Bart Conner. They started the Bart Conner Gymnastics Academy, Perfect 10 Production Company, and other ventures.