<P> Both sisters have been ranked by the Women's Tennis Association at the World No. 1 position in both singles & doubles . In 2002, after the French Open, Venus Williams and Serena Williams were ranked No. 1 and No. 2, respectively, marking the first time in history that sisters occupied the Top - 2 singles spots in the world rankings . During the 2010 French Open, they became the co-world No. 1 players in women's doubles . On 21 June 2010, Serena and Venus again held the No. 1 and No. 2 rankings spots in singles, respectively, some eight years after first accomplishing this feat . At the time, Serena was three months shy of her 29th birthday and Venus had just celebrated her 30th birthday . </P> <P> Both players have won four gold medals at the Summer Olympics Games, one each in singles and three in doubles--all won together--the most of any tennis players . Venus has also won a silver in mixed doubles at the 2016 Rio Olympics . As a duo, they have also completed the Career Golden Slam in doubles, twice . </P> <Table> <Tr> <Td> <Table> <Tr> <Th> Winner--Legend </Th> </Tr> <Tr> <Td> Grand Slam tournaments (14--0) </Td> </Tr> <Tr> <Td> Olympic Gold (3) </Td> </Tr> <Tr> <Td> WTA Tour Championships (0--0) </Td> </Tr> <Tr> <Td> Premier Mandatory & Premier 5 (2--0) </Td> </Tr> <Tr> <Td> Premier (2--1) </Td> </Tr> <Tr> <Td> International (1--0) </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Th> Finals by Surface </Th> </Tr> <Tr> <Td> Hard (10--1) </Td> </Tr> <Tr> <Td> Grass (7--0) </Td> </Tr> <Tr> <Td> Clay (3--0) </Td> </Tr> <Tr> <Td> Carpet (2--0) </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Td> <Table> <Tr> <Th> Winner--Legend </Th> </Tr> <Tr> <Td> Grand Slam tournaments (14--0) </Td> </Tr> <Tr> <Td> Olympic Gold (3) </Td> </Tr> <Tr> <Td> WTA Tour Championships (0--0) </Td> </Tr> <Tr> <Td> Premier Mandatory & Premier 5 (2--0) </Td> </Tr> <Tr> <Td> Premier (2--1) </Td> </Tr> <Tr> <Td> International (1--0) </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Th> Finals by Surface </Th> </Tr> <Tr> <Td> Hard (10--1) </Td> </Tr> <Tr> <Td> Grass (7--0) </Td> </Tr> <Tr> <Td> Clay (3--0) </Td> </Tr> <Tr> <Td> Carpet (2--0) </Td> </Tr> </Table> </Td> </Tr>

How old were the williams sisters when they started tennis