His age has long been a mystery, but fashion designer Karl Lagerfeld has finally revealed that he is 77. Inviting people to play a guessing game, he held a 70th birthday bash in 2008 and a party celebrating his 79th four years later. But in an interview with Paris Match the white-haired Chanel creative director stated that his real birthdate is September 10, 1935. Man of mystery: He has kept people guessing about his age for years, but Chanel designer Karl Lagerfeld, pictured at the label's couture show in January, has finally revealed that he is 77 He said that for decades he didn't know exactly what year he was born. It was only when his mother died that he discovered it was 1935 and not 1938 as stated on documentation. '[She] changed the [year]. It was easier to make a 3 or an 8 ... I don't know why she did it,' he explained. More... Great minds think alike! Marc Jacobs and Anna Wintour snapped wearing matching Prada fur coats to Great Gatsby premiere