Fourteen-year-old Romanian gymnast Nadia Comaneci (left) completes her perfect score performance during the 1976 Montreal Olympic Games. Great Britain's Tom Daley (center) stands outside the "Water Cube" during the 2008 Beijing Olympics Diving World Cup. U.S. diver Marjorie Gestring (right) floats through the air in a perfect swan dive.
Nadia Comaneci, Romanian Gymnast: At just 14, Nadia Comaneci was an Olympic princess at the 1976 Montreal Games. She was the first gymnast to ever receive a perfect 10 for her routine on the uneven bars. She didn't stop there, earning six more perfect scores and becoming the youngest all-around gymnastics gold medalist. The Romanian won a total of nine medals over the course of her Olympic career, five of them gold.
Marjorie Gestring, American Diver: Marjorie Gestring took the 1936 Berlin Olympics by storm when she was just 13 years old and won a gold medal in the 3m springboard contest. The 1936 games were her only Olympic appearance, but Gestring went down in history as one of the youngest Olympians ever to win a gold medal.
Tom Daley, British Diver: Tom Daley made his Olympic debut in Beijing in 2008 at age 14. The British diver didn't take home any medals from the Beijing Games, but made quite a splash for being the youngest member of the British Olympic team that year. He'll compete again in London this summer.