Question: What year is the show Young Sheldon, narrated by Jim Parsons, set in?

full_context: Document 1: The Big Bang Theory: The Big Bang Theory is an American television sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the series, along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007. The series' tenth season premiered on September 19, 2016. In March 2017, the series was renewed for two additional seasons, bringing its total to twelve, and running through the 2018–19 television season. The eleventh season premiered on September 25, 2017.
Document 2: Sheldon Cooper: Sheldon Lee Cooper, Ph.D., Sc.D., is a fictional character in the CBS television series "The Big Bang Theory" and "Young Sheldon", portrayed by actor Jim Parsons in "The Big Bang Theory" and Iain Armitage in "Young Sheldon". For his portrayal, Parsons has won four Primetime Emmy Awards, a Golden Globe Award, a TCA Award, and two Critics' Choice Television Awards. The childhood of the character is the focus of "Young Sheldon", the show being set in 1989, when 9-year-old Sheldon, who has skipped ahead four grades, starts high school alongside his older brother.
Document 3: Penny (The Big Bang Theory): Penny is a fictional character on the American CBS sitcom "The Big Bang Theory", portrayed by actress Kaley Cuoco. She is the primary female character in the series, befriending her across-the-hall neighbors Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons), two physicists who work at the nearby California Institute of Technology (Caltech). Penny's lack of advanced education, but outgoing personality and common sense drastically contrast with the personalities of the primary male characters in the series, even though she is considered part of their group. She is the love interest of Leonard, with whom she maintains a brief romantic relationship during the third season, which is later resumed in the fifth season and culminates in an engagement at the end of the seventh season and a wedding at the start of season 9. Penny is the only main character of the show whose last name has not been revealed, although she has been occasionally referred to or addressed with the last name Hofstadter since her wedding.
Document 4: Simon Helberg: Simon Maxwell Helberg (born December 9, 1980) is an American actor, comedian, and musician, best known for his role as Howard Wolowitz in the sitcom "The Big Bang Theory" (2007–), for which he won a Critics' Choice Television Award in 2013.
Document 5: Pilot (How I Met Your Mother): The pilot episode of the American television sitcom "How I Met Your Mother" premiered on CBS on September 19, 2005. It was written by series creators Carter Bays and Craig Thomas, and directed by Pamela Fryman The pilot takes place in 2030, as a future Ted Mosby (Voiced by Bob Saget) is telling his kids the story of how he met their mother. It flashes back to 2005 to a younger Ted (Josh Radnor) who meets Robin Scherbatsky (Cobie Smulders), a reporter who he becomes smitten for. Meanwhile, Ted's lawyer friend Marshall Eriksen (Jason Segel) plans on proposing to his girlfriend Lily Aldrin (Alyson Hannigan), a kindergarten teacher.
Document 6: Young Sheldon: Young Sheldon (stylized as young Sheldon) is an American television sitcom on CBS created by Chuck Lorre and Steven Molaro. The series is a spin-off prequel to "The Big Bang Theory" and follows the character Sheldon Cooper at the age of 9, living with his family in East Texas and going to high school. Iain Armitage stars as young Sheldon, alongside Zoe Perry, Lance Barber, Montana Jordan, and Raegan Revord. Jim Parsons, who portrays an adult Sheldon Cooper on "The Big Bang Theory", narrates the series and serves as an executive producer.
Document 7: Johnny Galecki: John Mark Galecki (born April 30, 1975) is an American actor. He is known for playing David Healy in the ABC sitcom "Roseanne" from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom "The Big Bang Theory" since 2007. Galecki also appeared in the films "National Lampoon's Christmas Vacation" (1989), "Prancer" (1989), "Suicide Kings" (1997), "I Know What You Did Last Summer" (1997), "Bookies" (2003), and "In Time" (2011).
Document 8: Kunal Nayyar: Kunal Nayyar ( ; Punjabi: born 30 April 1981) is a British-Indian actor known for his role as Rajesh Koothrappali in the CBS sitcom "The Big Bang Theory".
Document 9: Kaley Cuoco: Kaley Christine Cuoco ( ; born November 30, 1985) is an American actress. After a series of supporting film and television roles in the late 1990s, she landed her breakthrough role as Bridget Hennessy on the ABC sitcom "8 Simple Rules", on which she starred from 2002 to 2005. Thereafter, Cuoco appeared as Billie Jenkins on the final season of the television series "Charmed" (2005–2006). Since 2007, she has starred as Penny on the CBS sitcom "The Big Bang Theory", for which she has received Satellite, Critics' Choice, and People's Choice Awards. Cuoco's film work includes roles in "To Be Fat like Me" (2007), "Hop" (2011) and "Authors Anonymous" (2014). She received a star on the Hollywood Walk of Fame in 2014.
Document 10: Steven Molaro: Steven Molaro, also known as Steve Molaro, is an American television producer and writer. He has worked on such productions as "Freddie", "The Class", "Complete Savages" and the Dan Schneider-produced series "All That", "The Amanda Show", "What I Like About You", "Drake & Josh", "Zoey 101" and "iCarly". Since 2007, he has been a producer/writer on the sitcom "The Big Bang Theory"., Molaro also co-created it's prequel spinoff, "Young Sheldon" with Chuck Lorre.
Document 11: Mayim Bialik: Mayim Chaya Bialik ( , ) (born December 12, 1975) is an American actress and neuroscientist. From 1991 to 1995, she played the title character of NBC's "Blossom". Since 2010, she has played Dr. Amy Farrah Fowler – like the actress, a neuroscientist – on CBS's "The Big Bang Theory", a role for which she has been nominated four times for the Primetime Emmy Award for Outstanding Supporting Actress in a Comedy Series, and won a Critic's Choice Television Award for Best Supporting Actress in a Comedy Series.
Document 12: Howard Wolowitz: Howard Joel Wolowitz, M.Eng. is a fictional character on the CBS television series "The Big Bang Theory", portrayed by actor Simon Helberg. Among the main male characters in the show, Howard is distinctive for being an engineer rather than a physicist and lacking a doctoral degree.
Document 13: Caleb McLaughlin: Caleb McLaughlin (born October 13, 2001) is an American actor. He began his career on the Broadway stage as Young Simba in the musical "The Lion King". Since 2016, he has portrayed Lucas Sinclair in the Netflix science fiction drama series "Stranger Things". Industry reports have confirmed that he will return in Season 2. In 2017, McLaughlin appeared in the BET miniseries "The New Edition Story" as Ricky Bell.
Document 14: Dinosaur Train: Dinosaur Train is an American/Canadian/Singaporean children's animated series created by Craig Bartlett, who also created "Hey Arnold!". The series features a curious young "Tyrannosaurus rex" named Buddy who, together with his adopted "Pteranodon" family, takes the Dinosaur Train to explore his time period, and have adventures with all kinds of dinosaurs. It is produced by The Jim Henson Company in association with Media Development Authority, Sparky Animation, FableVision, and Snee-Oosh, Inc.
Document 15: Leonard Hofstadter: Leonard Leakey Hofstadter, Ph.D., is a fictional character in the CBS television series "The Big Bang Theory", in which he is portrayed by actor Johnny Galecki. Leonard is an experimental physicist, who shares an apartment with colleague and best friend Dr. Sheldon Cooper (Jim Parsons). For his portrayal, Galecki was nominated for a Primetime Emmy Award and a Golden Globe Award in 2011.
ground_truth: 1989