Who became the youngest actor to be awarded a knighthood, receiving the honour in 1947?

Laurence Kerr Olivier, Baron Olivier (22 May 1907 – 11 July 1989) was an English actor who, along with his contemporaries Ralph Richardson and John Gielgud, dominated the British stage of the mid-20th century. He also worked in films throughout his career, playing more than fifty cinema roles. Late in his career, he had considerable success in television roles.

By the mid-40s, Olivier had achieved international stardom in “Rebecca,” “Pride and Prejudice,” and “Hamlet” and became an accomplished a director with the film versions of “Henry V,” “Hamlet” and “Richard III.”

Olivier's career was filled with accolades, such as his 1947 knighthood (at the age of 40 he was the youngest actor to be so honoured), 11 Oscar nominations (winning Best Actor for “Hamlet”), a 1947 honorary "outstanding achievement" Oscar for “Henry V,” 11 BAFTA nominations/three wins, a Tony, and nine Emmy nominations/four wins.