Background: Duncan began her dancing career at a very early age by giving lessons in her home to neighbourhood children, and this continued through her teenage years. Her novel approach to dance was evident in these early classes, in which she "followed [her] fantasy and improvised, teaching any pretty thing that came into [her] head". A desire to travel brought her to Chicago, where she auditioned for many theater companies, finally finding a place in Augustin Daly's company. This took her to New York City where her unique vision of dance clashed with the popular pantomimes of theater companies.
Context: On the night of September 14, 1927, in Nice, France, Duncan was a passenger in an Amilcar CGSS automobile owned by Benoit Falchetto, a French-Italian mechanic. She wore a long, flowing, hand-painted silk scarf, created by the Russian-born artist Roman Chatov, a gift from her friend Mary Desti, the mother of American film director Preston Sturges. Desti, who saw Duncan off, had asked her to wear a cape in the open-air vehicle because of the cold weather, but she would only agree to wear the scarf. As they departed, she reportedly said to Desti and some companions, "Adieu, mes amis. Je vais a la gloire!" ("Farewell, my friends. I go to glory!"); but according to the American novelist Glenway Wescott, Desti later told him that Duncan's actual parting words were, "Je vais a l'amour" ("I am off to love"). Desti considered this embarrassing, as it suggested that she and Falchetto were going to her hotel for a tryst.  Her silk scarf, draped around her neck, became entangled around the open-spoked wheels and rear axle, pulling her from the open car and breaking her neck. Desti said she called out to warn Duncan about the scarf almost immediately after the car left. Desti brought Duncan to the hospital, where she was pronounced dead.  As The New York Times noted in its obituary: "Isadora Duncan, the American dancer, tonight met a tragic death at Nice on the Riviera. According to dispatches from Nice, Duncan was hurled in an extraordinary manner from an open automobile in which she was riding and instantly killed by the force of her fall to the stone pavement." Other sources noted that she was almost decapitated by the sudden tightening of the scarf around her neck. The accident gave rise to Gertrude Stein's mordant remark that "affectations can be dangerous". At her death, Duncan was a Soviet citizen. Her will was the first of a Soviet citizen to be probated in the U.S.  Duncan was cremated, and her ashes were placed next to those of her children in the columbarium at Pere Lachaise Cemetery in Paris. On the headstone of her grave is inscribed Ecole du Ballet de l'Opera de Paris ("Ballet School of the Opera of Paris").
Question: How old was Duncan when she died?

Answer: