<Ul> <Li> Fashion designers </Li> <Li> actresses </Li> </Ul> <Tr> <Th> Years active </Th> <Td> Ashley: 1987--2004 (actress) Mary - Kate: 1987--2012 (actress) Both: 2004--present (fashion designers) </Td> </Tr> <P> Mary - Kate Olsen and Ashley Olsen (born June 13, 1986), also known as the Olsen twins collectively, are American fashion designers and former child actresses . The fraternal twins made their acting debut as infants playing Michelle Tanner on the television series Full House . At the age of six, Mary - Kate and Ashley Olsen began starring together in TV, film, and video projects, which continued to their teenage years . Through their company Dualstar, the Olsens joined the ranks of the wealthiest women in the entertainment industry at a young age . </P> <P> The twins were born in Sherman Oaks, California to David "Dave" Olsen (b . 1953) and Jarnette "Jarnie" (née Jones; b . 1954). Despite being very similar in appearance, they are not identical, but sororal twins . They have an elder brother, Trent, and a younger sister, actress Elizabeth, as well as a half - sister, Courtney Taylor, and a half - brother, Jake . The twins' parents divorced in 1995; Taylor and Jake are from their father's second marriage to McKenzie . The Olsen twins have English and Norwegian ancestry . </P>

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