Mary-Kate and Ashley Olsen, both 33, have been in the public eye since they were a year old! The twins were born on June 13, 1986 and one year later landed the role of baby Michelle Tanner on the ABC sitcom Full House. Since infants and children can only work a limited number of hours on set, the twins took turns in the role for the duration of the show’s run, from 1987 to 1995.