Question: Who is younger Mike Tyson or Buster Douglas ?

full_context: Document 1: Tyson Fury: Tyson Luke Fury (born 12 August 1988) is a British professional boxer. He has held the "Ring" magazine heavyweight title since 2015, after defeating long-reigning world champion Wladimir Klitschko. In the same fight, Fury also won the unified WBA (Super), IBF, WBO, IBO and lineal titles, with the victory earning him Fighter of the Year and Upset of the Year awards by "The Ring". Fury was subsequently stripped of the IBF title later that year for being unable to grant a fight against their mandatory challenger, Vyacheslav Glazkov, due to agreeing to a rematch with Klitschko. In 2016, Fury vacated the WBA, WBO, IBO, and lineal titles following an ongoing medical investigation and personal issues and two cancellations of the Klitschko rematch. In August 2016, Fury was ranked by BoxRec as the world's sixth best active boxer, pound for pound.
Document 2: Mike Tyson: Michael Gerard Tyson ( ; born June 30, 1966) is an American former professional boxer who competed from 1985 to 2005. He reigned as the undisputed world heavyweight champion and holds the record as the youngest boxer to win a heavyweight title at 20 years, 4 months and 22 days old. Tyson won his first 19 professional fights by knockout, 12 of them in the first round. He won the WBC title in 1986 after stopping Trevor Berbick in two rounds, and added the WBA and IBF titles after defeating James Smith and Tony Tucker in 1987. This made Tyson the first heavyweight boxer to simultaneously hold the WBA, WBC and IBF titles, and the only heavyweight to successively unify them.
Document 3: Mike Tyson vs. Buster Douglas: Mike Tyson vs. Buster Douglas, billed as "Tyson Is Back!", was a historic boxing match that occurred at the Tokyo Dome in Tokyo, Japan on February 11, 1990, in which then undefeated, undisputed heavyweight champion Mike Tyson lost via knockout to the 42–1 underdog Buster Douglas. The fight is widely considered one of the biggest upsets in sports history.
Document 4: Lennox Lewis vs. Mike Tyson: Lennox Lewis vs. Mike Tyson, billed as "Lewis–Tyson: Is On", was a professional boxing match that took place on June 8, 2002 at the Pyramid Arena in Memphis, Tennessee, United States, between IBF, IBO and WBC heavyweight champion Lennox Lewis and former IBF, WBA and WBC heavyweight champion Mike Tyson. The fight was for Lewis' heavyweight championship titles. Lewis defeated Tyson by knockout in the eighth round.
Document 5: Buster Douglas vs. Evander Holyfield: Buster Douglas vs Evander Holyfield, billed as "The Moment of Truth", was a professional boxing match contested on October 25, 1990 for the WBA, WBC, IBF, "The Ring" and lineal Heavyweight championships. The bout took place at The Mirage in Paradise, Nevada, USA and saw Douglas making the first defense of the titles he won from Mike Tyson in February 1990.
Document 6: Donovan Ruddock: Donovan "Razor" Ruddock (born December 21, 1963) is a Canadian former professional boxer who competed from 1982 to 2001, and in 2015. A promising heavyweight of the late 1980s and early 1990s, Ruddock earned his nickname of "Razor" for his cutting jab, although he was better known for his powerful hybrid left hook/uppercut, which he called "The Smash". One of the best exhibitions of his left hand power was his brutal knockout of former WBA heavyweight champion Michael Dokes in 1990. Ruddock is also known for his two fights against Mike Tyson in 1991, and Lennox Lewis 1992.
Document 7: James Tillis: James Tillis (born July 5, 1957) is a former professional boxer. Known as "Quick", he was known for his fast hand speed. Tillis challenged for the WBA world heavyweight title in 1981, but was defeated by fifteen round unanimous decision to Mike Weaver. Tillis was the first man to go the distance with a prime Mike Tyson in 1986. He holds notable wins over Ron Stander by TKO 7 in 1980, and the hard punching Earnie Shavers by ten-round decision in 1982. Tillis fought for the last time in 2001 at the age of 44.
Document 8: Final Blow: Final Blow is a boxing arcade game created in 1988 by Taito. The name would remain the same for all ported platforms, except for the Sega Mega Drive/Genesis versions, which Sega released outside Japan as James 'Buster' Douglas Knockout Boxing featuring Buster Douglas himself in 1990 immediately after his victory over Mike Tyson.
Document 9: Frank Bruno: Franklin Roy "Frank" Bruno, {'1': ", '2': ", '3': ", '4': "} (born 16 November 1961) is a British former professional boxer who competed from 1982 to 1996. Bruno had a highly publicised and extremely eventful career. The pinnacle of his boxing career was winning the WBC heavyweight title, in what was his fourth world championship challenge. He also held the European heavyweight title earlier in his career. Bruno was one of the most well-loved and recognisable boxers in British history, and faced multiple top-rated heavyweights during his career including two bouts with Mike Tyson and a domestic clash against Lennox Lewis. He won the WBC title in 1995 after defeating Oliver McCall at a packed Wembley Stadium. Bruno was known for his excellent punching power: he won 40 of his 45 bouts and 38 by knockout, giving him a 95% knockout rate from the fights he won; his overall knockout percentage is 84.44%. Like Henry Cooper before him, Bruno has remained a popular celebrity with the British public following his retirement from boxing.
Document 10: Leon Spinks: Leon Spinks (born July 11, 1953) is an American former professional boxer who competed from 1977 to 1995. In only his eighth professional fight, he won the undisputed heavyweight championship in 1978 after defeating Muhammad Ali via split decision, in what was considered one of the biggest upsets in boxing history. Spinks was later stripped of the WBC title for facing Ali in an unapproved rematch seven months later, which he lost by unanimous decision.
Document 11: Tommy Morrison: Tommy David Morrison (January 2, 1969 – September 1, 2013) was an American professional boxer who competed from 1988 to 1996, and held the WBO heavyweight title in 1993. He retired from boxing in 1996 when he tested positive for HIV, but returned for two more fights in 2007 and 2008. Morrison is also known for starring alongside Sylvester Stallone in the 1990 film "Rocky V".
Document 12: Buster Douglas: James "Buster" Douglas (born April 7, 1960) is an American former professional boxer who competed from 1981 to 1990, and 1996 to 1999. He is best known for his stunning upset of Mike Tyson on February 11, 1990 in Tokyo to win the undisputed heavyweight title. At the time Tyson was undefeated and considered to be the best boxer in the world, as well as one of the most feared heavyweight champions in history due to his domination of the division over the previous three years. The only casino to make odds for the fight (all others declining to do so as they considered the fight such a foregone conclusion) had Douglas as a 42-to-1 underdog for the fight, making his victory, in commentator Jim Lampley's words, "The biggest upset in the history of heavyweight championship fights." Douglas held the title for eight months and two weeks, losing on October 25, 1990 to Evander Holyfield via third-round knockout, in his only title defense.
Document 13: Jack Johnson (boxer): John Arthur "Jack" Johnson (March 31, 1878 – June 10, 1946), nicknamed the Galveston Giant, was an American boxer, who—at the height of the Jim Crow era—became the first African American world heavyweight boxing champion (1908–1915). Johnson went on to become one of the most dominant champions of his time, and remains a significant historical figure in heavyweight boxing history, with his 1910 fight against James J. Jeffries being dubbed the "fight of the century." Johnson was faced with much controversy when he was charged with violating the Mann Act in 1912, even though there was an obvious lack of evidence and the charge was largely racially based. In a documentary about his life, Ken Burns notes that "for more than thirteen years, Jack Johnson was the most famous and the most notorious African-American on Earth".
Document 14: Lamon Brewster: Lamon Tajuan Brewster (born June 5, 1973) is an American former professional boxer who competed from 1996 to 2010. He held the WBO heavyweight title from 2004 to 2006, and is best known for scoring an upset knockout victory over Wladimir Klitschko to win the vacant title. As an amateur, Brewster won the U.S. national championships in 1995, and a silver medal at that year's Pan American Games, both in the heavyweight division. Following his retirement from the sport in 2011, he became an entrepreneur and founded a consulting business.
Document 15: Mike Tyson vs. Evander Holyfield: Mike Tyson vs. Evander Holyfield, billed as "Finally", was a professional boxing match fought between Evander Holyfield and Mike Tyson for the World Boxing Association heavyweight championship on November 9, 1996 at the MGM Grand Garden Arena in Paradise, Nevada. The bout was Tyson's first defense of the WBA title that he had won from Bruce Seldon on September 7 of that year.
ground_truth: Mike Tyson