Background: Sunset Boulevard (stylized onscreen as SUNSET BLVD.) is a 1950 American film noir directed and co-written by Billy Wilder, and produced and co-written by Charles Brackett. It was named after the thoroughfare that runs through Los Angeles and Beverly Hills, California. The film stars William Holden as Joe Gillis, an unsuccessful screenwriter, and Gloria Swanson as Norma Desmond, a faded silent-film star who draws him into her fantasy world, where she dreams of making a triumphant return to the screen.
Context: The street known as Sunset Boulevard has been associated with Hollywood film production since 1911, when the town's first film studio opened there. The film workers lived modestly in the growing neighborhood, but during the 1920s, profits and salaries rose to unprecedented levels. With the advent of the star system, luxurious homes noted for their often incongruous grandeur were built in the area.  As a young man living in Berlin in the 1920s, Billy Wilder was interested in American culture, with much of his interest fueled by the country's films. In the late 1940s, many of the grand Hollywood houses remained, and Wilder, then a Los Angeles resident, found them to be a part of his everyday world. Many former stars from the silent era still lived in them, although most were no longer involved in the film business. Wilder wondered how they spent their time now that "the parade had passed them by" and began imagining the story of a star who had lost her celebrity and box-office appeal.  The character of Norma Desmond mirrors aspects of the twilight years of several real-life faded silent-film stars, such as the reclusive existence of Mary Pickford and the mental disorders of Mae Murray and Clara Bow. It is usually regarded as a fictional composite inspired by several different people, not just a thinly disguised portrait of one in particular. Nevertheless, some commentators have tried to identify specific models. One asserts that Norma Talmadge is "the obvious if unacknowledged source of Norma Desmond, the grotesque, predatory silent movie queen" of the film. The most common analysis of the character's name is that it is a combination of the names of silent film actress Mabel Normand and director William Desmond Taylor, a close friend of Normand's who was murdered in 1922 in a never-solved case sensationalized by the press.
Question: What time period were these silent-film stars active in?
Answer: the 1920s,

Problem: Background: Moss was born in London, son of Alfred Moss, a dentist of Bray, Berkshire, and Aileen (nee Craufurd). He was brought up at Long White Cloud house on the right bank of the River Thames. His father was an amateur racing driver who had placed 16th at the 1924 Indianapolis 500. Stirling was a gifted horse rider as was his younger sister, Pat Moss, who became a successful rally driver and married Erik Carlsson.
Context: Although ostensibly retired from racing since 1962, Moss did make a number of one-off appearances in professional motorsport events in the following two decades. He also competed in the 1974 London-Sahara-Munich World Cup Rally in a Mercedes-Benz, but retired from the event in the Algerian Sahara. The Holden Torana he shared with Jack Brabham in the 1976 Bathurst 1000 was hit from behind on the grid and eventually retired with engine failure. Moss, at the wheel of the Torana when the V8 engine let go, was criticised by other drivers for staying on the racing line for over  2/3  of the 6.172 km long circuit while returning to the pits as the car was dropping large amounts of oil onto the road. He also shared a Volkswagen Golf GTI with Denny Hulme in the 1979 Benson & Hedges 500 at Pukekohe Park Raceway in New Zealand.  In 1980 he made a comeback to regular competition, in the British Saloon Car Championship with the works-backed GTi Engineering Audi team. For the 1980 season Moss was the team's number two driver to team co-owner Richard Lloyd. For the 1981 season Moss stayed with Audi, as the team moved to Tom Walkinshaw Racing management, driving alongside Martin Brundle.  Throughout his retirement he raced in events for historic cars, driving on behalf of and at the invitation of others, as well as campaigning his own OSCA FS 372 and other vehicles.  On 9 June 2011 during qualifying for the Le Mans Legends race, Moss announced on Radio Le Mans that he had finally retired from racing, saying that he had scared himself that afternoon. He was 81.
Question: When was his last race?
Answer:
On 9 June 2011 during