Born in Dinard of an architect father and a musician mother, Delaage played at a very young age in front of Alfred Cortot who offered to become her private teacher.
A friend of Dino Ciani, a young Italian pianist who died prematurely, she also received technical advice from György Cziffra, before pursuing a career as an international concert performer.
Although for a long time there were few recordings available, a concert she gave in 2001 at the New Theatre of Turin was the subject of a CD, with pieces by Chopin, Ravel and Debussy.
On the occasion of the disappearance fifty years ago of Alfred Cortot, she gave a concert on 15 June 2012 at the Temple Saint Marcel,[2] in the 5th arrondissement of Paris.
[3] By decree of 30 December 2016 of the Presidency of the French Republic, she was appointed, on the report of the Prime Minister, chevalier of the Légion d'honneur.