Born on 10 May 1975 in the Paris region, Olivier Delafosse learned to play the piano as a child. At the age of 14, he began to compose songs that he played in a band of high school students. He went on to study musicology, became a teacher in college after that. After relocating to Paris, Oldelaf joined the band Les Petits Humains ('The Little Humans') in 1997. They played several live concert and recorded two albums that were not available commercially but appeared on the band's website. In June 2003, the band folded. Between 2000 and 2010, Oldelaf formed the band Oldelaf et Monsieur D together with comedian Frédéric Draps. In March 2003, Oldelaf joined Les Fatals Picards as guitarist for the album 'Picardia Independenza'. In 2010, Oldelaf surrounded himself with four musicians and started his proper solo career. New songs and some old mingled in a colorful live set. Oldelaf and his musicians tour all over France and also participate in festivals in Belgium and France. The debut album 'Le Monde Est Beau' ('The World Is Beautiful') is released in 2010. In 2013, Oldelaf records a new album 'Dimanche', released in January 2014. To finance this album, he uses crowdfunding like he did before for his music videos. A tour of more than 100 dates accompanies the release of 'Dimanche' and reaches its apotheosis during a concert at the Zenith in Paris on 29 November 2014, which is recorded and made available on DVD in April 2016. Also, in 2014 performs a cover version of Babooshka with a heavy French accent as part of a series of 'Les Reprises d’Oldelaf', which appears on YouTube.