The mystery of Karl Lagerfeld's real birthday Karl Lagerfeld will be wished a happy 80th birthday by many today, but we explain why you shouldn't be too quick to prematurely age the German designer. Many fashionistas will be wishing Karl Lagerfeld, the creative genius at Chanel, Fendi and his eponymous label, a very happy 80th birthday today. Should you Google the leather glove-sporting designer's Wikipedia page, or type in 'Karl Lagerfeld birthday', it clearly states that his date of birth is September 10, 1933. However multi-tasking Lagerfeld was not born then. But his exact birth date remains as much of a mystery as why he once agreed to design a hotel suite out of chocolate. Lagerfeld's spokesperson confirmed to The Telegraph that the designer was in fact born in 1938, making him 75 today. But in an interview with Paris Match earlier this year, the German native revealed that he was actually born in 1935, making him 78. DISCOVER: Karl Lagerfeld's most outrageous insults The confusion? It's all down to Lagerfeld's mother, who modified her gifted son's birth date, leading to uncertainty between 1933 and 1938. In fact, it turned out to be neither of these dates - and it seems search engines haven't caught up yet. My mother changed the date. It was easier to write a 3 or an 8," he explained. Lagerfeld has previously admitted that he won't ever retire, so age really is just a number to him. And while we'll have to assume that he is turning 75 or 78 today (we'd put money on the latter), it's safe to take this parting quote via his spokeswoman: "Everyone knows that I'm 100 years old... So it doesn't matter how old I am!" Joyeux anniversaire, Karl!