Question: How many decades did the career of the American actor, who starred in "The Happy Ending," span?

full_context: Document 1: Loving (1970 film): Loving is a 1970 American comedy film released by Columbia Pictures and directed by Irvin Kershner. It is based on the novel "Brooks Wilson Ltd." written by pulp magazine illustrator John McDermott under his pen name, J. M. Ryan. The movie starred George Segal in the title role of a philandering NYC illustrator and Eva Marie Saint as his wife. The cast also included Sterling Hayden, David Doyle, Keenan Wynn, Roy Scheider and future 20th Century Fox president Sherry Lansing, among others.
Document 2: Katharine Ross: Katharine Juliet Ross (born January 29, 1940) is an American film and stage actress. She starred in three of the most popular films of the 1960s and 1970s: as Elaine Robinson in "The Graduate" (1967), for which she received an Academy Award nomination for Best Supporting Actress; as Etta Place in "Butch Cassidy and the Sundance Kid" (1969), for which she won a BAFTA Award for Best Actress; and "The Stepford Wives" (1975). She won a Golden Globe for "Voyage of the Damned" (1976).
Document 3: Henry Fonda: Henry Jaynes Fonda (May 16, 1905 – August 12, 1982) was an American film and stage actor with a career spanning five decades.
Document 4: Johnny Carson: John William Carson (October 23, 1925 – January 23, 2005) was an American talk show host and comedian, best known for his 30 years as host of "The Tonight Show Starring Johnny Carson" (1962–1992). Carson received six Emmy Awards, the Television Academy's 1980 Governor's Award, and a 1985 Peabody Award. He was inducted into the Television Academy Hall of Fame in 1987. Carson was awarded the Presidential Medal of Freedom in 1992 and received a Kennedy Center Honor in 1993.
Document 5: The Inn of the Sixth Happiness: The Inn of the Sixth Happiness is a 1958 DeLuxe Color 20th Century Fox CinemaScope film based on the true story of Gladys Aylward, a tenacious British maid, who became a missionary in China during the tumultuous years leading up to World War II. Directed by Mark Robson, who received an Academy Award for Best Director nomination, the film stars Ingrid Bergman as Aylward and Curt Jürgens as her love interest, Colonel Lin Nan, a Chinese officer with a Dutch father. Robert Donat, who played the mandarin of the town in which Aylward lived, died before the film was released. The musical score was composed and conducted by Malcolm Arnold. The cinematography was by Freddie Young.
Document 6: The End (1978 film): The End is a 1978 American black comedy directed by and starring Burt Reynolds, written by Jerry Belson, and with music composed by Paul Williams. The film also stars Dom DeLuise, Sally Field, Strother Martin, David Steinberg, Joanne Woodward, Norman Fell, Myrna Loy, Kristy McNichol, Pat O'Brien, Robby Benson and Carl Reiner.
Document 7: The Happy Ending: The Happy Ending is a 1969 drama film written and directed by Richard Brooks, which tells the story of a repressed housewife who longs for liberation from her husband and daughter. It stars Jean Simmons (who received an Oscar nomination), John Forsythe, Shirley Jones, Lloyd Bridges and Teresa Wright.
Document 8: James Earl Jones: James Earl Jones (born January 17, 1931) is an American actor. His career has spanned more than 60 years, and he has been described as "one of America's most distinguished and versatile" actors and "one of the greatest actors in American history." Since his Broadway debut in 1957, Jones has won many awards, including a Tony Award and Golden Globe Award for his role in "The Great White Hope". Jones has won three Emmy Awards, including two in the same year in 1991, and he also earned an Academy Award nomination for Best Actor in a Leading Role in the film version of "The Great White Hope". He is also known for his voice roles as Darth Vader in the "Star Wars" film series and Mufasa in Disney's "The Lion King", as well as many other film, stage and television roles.
Document 9: The Happy Ending (1931 film): The Happy Ending is a 1931 British drama film directed by Millard Webb and starring George Barraud, Daphne Courtney and Alfred Drayton. Its plot concerns a father who deserted his family some years before returning home only to find his wife has told his children and neighbours that he died as a hero when he abandoned them. A silent version "The Happy Ending" had been made in 1925 based on the same play.
Document 10: Danny Thomas: Amos Muzyad Yakhoob Kairouz (January 6, 1912 – February 6, 1991), known professionally by his stage name Danny Thomas, was an American nightclub comedian, singer, actor, and producer, whose career spanned five decades. He created and starred in one of the most successful and long running situation comedies in the history of American network television. In addition to guest roles on many of the comedy, talk and musical variety programs of his time, his legacy includes a lifelong dedication to fundraising for charity.
Document 11: These Old Broads: These Old Broads is a 2001 television film written by Carrie Fisher and starring her mother Debbie Reynolds, as well as Shirley MacLaine, Joan Collins, and Elizabeth Taylor in her final film role. In a 2001 BBC "Omnibus" documentary about Elizabeth Taylor, Shirley MacLaine says that Julie Andrews and Lauren Bacall were originally planned to be in the movie. The role of Miriam Hodges was originally offered to June Allyson.
Document 12: The John Forsythe Show: The John Forsythe Show began as a situation comedy in the fall of 1965 on NBC, but at mid-season it switched to a spy show. In the first phase of the series, John Forsythe appeared as United States Air Force veteran John Foster, who inherited the private Foster School for Girls in San Francisco, California, from his late aunt, Victoria. Forsythe's co-stars were Elsa Lanchester as the principal, Miss Culver; Ann B. Davis, as the physical education teacher, Miss Wilson; and Guy Marks as Ed Robbins, Forsythe's aide and a former sergeant. Actors who portrayed students included Pamelyn Ferdin as Pamela, Darlene Carr as Kathy, Page and Brooke Forsythe (Forsythe's actual daughters) as Marcia and Norma Jean, Peggy Lipton, as Joanna, Tracy Stratford as Susan, and Sara Ballantine as Janice.
Document 13: A House Is Not a Home (film): A House Is Not a Home is a 1964 drama film loosely based on the 1953 autobiography by madam Polly Adler. The film stars Shelley Winters, Robert Taylor, Cesar Romero, and Kaye Ballard. Raquel Welch made her film debut in a small role as a call girl. The song written for the film by Burt Bacharach & Hal David has become a standard.
Document 14: John Forsythe: John Forsythe (born either John Lincoln Freund or Jacob Lincoln Freund; January 29, 1918 – April 1, 2010) was an American stage, film/television actor, producer, narrator, drama teacher and philanthropist whose career spanned six decades. He also appeared as a guest on several talk and variety shows and as a panelist on numerous game shows.
Document 15: Fred Astaire: Fred Astaire (born Frederick Austerlitz; May 10, 1899 – June 22, 1987) was an American dancer, singer, actor, choreographer and television presenter.
ground_truth: six