Background: Vivien Leigh (born Vivian Mary Hartley, and also known as Lady Olivier after 1947; 5 November 1913 - 8 July 1967) was an English stage and film actress. She won two Academy Awards for Best Actress, for her iconic performances as Scarlett O'Hara in Gone with the Wind (1939) and Blanche DuBois in the film version of A Streetcar Named Desire (1951), a role she had also played on stage in London's West End in 1949. She also won a Tony Award for her work in the Broadway musical version of Tovarich (1963). After completing her drama school education, Leigh appeared in small roles in four films in 1935 and progressed to the role of heroine in Fire Over England (1937).
Context: Leigh was born Vivian Mary Hartley on 5 November 1913 in British India on the campus of St. Paul's School, Darjeeling. She was the only child of Ernest Richard Hartley, a British broker, and his wife, Gertrude Mary Frances (nee Yackjee; she also used her mother's maiden name of Robinson). Her father was born in Scotland in 1882, while her mother, a devout Roman Catholic, was born in Darjeeling in 1888 and was of Irish descent. Gertrude's parents, who lived in India, were Michael John Yackjee (born 1840), a man of independent means, and Mary Teresa Robinson (born 1856), who was born to an Irish family killed during the Indian Rebellion of 1857 and grew up in an orphanage, where she met Yackjee; they married in 1872 and had five children, of whom Gertrude was the youngest. Ernest and Gertrude Hartley were married in 1912 in Kensington, London.  In 1917, Ernest Hartley was transferred to Bangalore as an officer in the Indian Cavalry, while Gertrude and Vivian stayed in Ootacamund. At the age of three, young Vivian made her first stage appearance for her mother's amateur theatre group, reciting "Little Bo Peep". Gertrude Hartley tried to instill an appreciation of literature in her daughter and introduced her to the works of Hans Christian Andersen, Lewis Carroll and Rudyard Kipling, as well as stories of Greek mythology and Indian folklore. At the age of six, Vivian was sent by her mother from Loreto Convent, Darjeeling, to the Convent of the Sacred Heart (now Woldingham School) then situated in Roehampton, southwest London. One of her friends there was future actress Maureen O'Sullivan, two years her senior, to whom Vivian expressed her desire to become "a great actress". She was removed from the school by her father, and travelling with her parents for four years, she attended schools in Europe, notably in Dinard, Biarritz, San Remo and Paris, becoming fluent in both French and Italian. The family returned to Britain in 1931. She attended A Connecticut Yankee, one of O'Sullivan's films playing in London's West End, and told her parents of her ambitions to become an actress. Shortly after, her father enrolled Vivian at the Royal Academy of Dramatic Art (RADA) in London.  Vivian met Herbert Leigh Holman, known as Leigh Holman, a barrister 13 years her senior, in 1931. Despite his disapproval of "theatrical people", they married on 20 December 1932 and she terminated her studies at RADA, her attendance and interest in acting having already waned after meeting Holman. On 12 October 1933 in London, she gave birth to a daughter, Suzanne, later Mrs. Robin Farrington.
Question: When did she begin acting?

Answer:
At the age of three, young Vivian made her first stage appearance for her mother's amateur theatre group, reciting "Little Bo Peep