45 and 38
Billy Tubbs (born March 5, 1935 ) was 45 when hired at OU in 1980.
http://www.jimthorpeassoc.org/Articles/Billy Tubbs.html
http://en.wikipedia.org/wiki/Billy_Tubbs
Tubbs was a three-year basketball letterman at Tulsa’s Central High. He was a two-year letterman at Lamar for Coach Jack Martin, and began his coaching career as Martin’s assistant coach from 1960-1971. Beginning his head coaching career at Southwestern University in Texas in 1971, Tubbs posted a 31-24 record over two years. Returning to Lamar as head coach from 1976-1979, he guided the Cardinals out of the shadows and into the national spotlight to a 75-46 record and the school’s first two NCAA Tournament appearances. His Cardinals won three straight Southland Conference titles, and Tubbs was named SLC Coach of the Year following both the 1978 and 1980 campaigns.
Taking the reins at the University of Oklahoma in 1980, he was faced with the challenge of rebuilding a program that had been to the NCAA Tournament only once in the 33 previous seasons. Tubbs posted a 333-132 record in 14 years, leading the Sooners to the national championship game in 1988. He took OU to nine NCAA and four NIT tournaments, including a streak of six straight “Sweet 16” appearances from 1985-1990. His OU teams had 13 winning seasons and won five conference championships. Tubbs was the Big Eight Coach of the Year in 1984, 1985, 1988 and 1989, and was named Basketball Weekly National Coach of the Year in 1983 and 1985. His fast-paced style of play on offense and high-pressure defense changed the way people looked at Oklahoma basketball.
Tubbs achieved many coaching milestones during his coaching career, including becoming the ninth coach in NCAA history to record 100 wins at three different schools (Oklahoma 333, TCU 156 and Lamar 121). He became the 28th coach in NCAA Division I history to record 600 wins in Lamar’s 79-67 win over Texas Southern during the 2003-04 season.
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Kelvin Sampson (born October 5, 1955) became the 11th head coach at the University of Oklahoma on April 25, 1994, when he was 38 years old.
http://en.wikipedia.org/wiki/Kelvin_Sampson
Sampson was named national coach of the year in 1995 (his first year at OU) by the Associated Press, United States Basketball Writers Association and Basketball Weekly after guiding the Sooners to 23-9 overall and 15-0 home marks. It was the second-best overall record posted by a first-year coach in Big 8 history.
Coach Sampson possesses the highest winning percentage in Oklahoma history (.721). He guided OU to eight consecutive 20-win seasons. He averaged 25.0 wins over those eight campaigns and 26.0 victories over the last six years. He directed the Sooners to postseason tournament berths in each of his 11 seasons (10 NCAA Tournaments), with a Sweet 16 showing in 1999, a Final Four appearance in 2002 and an Elite Eight appearance in 2003. His teams also played in the Big 12 Tournament title game five times in his last eight years. In 2001, 2002, and 2003 the Sooners won that tournament. Sampson held the conference's best Big 12 Tournament record (17-6).
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