Minimum Number of Years Since Last Final Four

If you add up the number of years since each team's last final four for each team, it adds up to 17:

Kentucky 1
Kansas 4
Ohio State 5
Louisville 7

17 is the sixth lowest all-time for final fours in which all four teams are making a repeat appearance. There have been 23 times in which all 4 teams have been to the final four before.

Here is a list of each time with the sum of the number of year's since the previous appearance:

1951 - 9 (Illinois - 2, Kentucky - 2, Oklahoma State - 2, Kansas State - 3)
1968 - 9 (Houston - 1, North Carolina - 1, UCLA - 1, Ohio State - 6)
1984 - 12 (Houston - 1, Georgetown - 2, Virginia - 3, Kentucky - 6)
1991 - 14 (Duke - 1, UNLV - 1, Kansas - 3, North Carolina - 9)
1993 - 14 (Michigan - 1, Kansas - 2, North Carolina - 2, Kentucky - 9)
2012 - 17 (Kentucky - 1, Kansas - 4, Ohio State - 5, Louisville - 7)
1986 - 28 (Louisville - 3, Louisiana State - 5, Duke - 8, Kansas - 12)
1960 - 31 (California - 1, Cincinnati - 1, Ohio State - 14, New York - 15)
2004 - 31 (Duke - 3, Connecticut - 5, Oklahoma State - 9, Georgia Tech - 14)
2007 - 32 (Florida - 1, UCLA - 1, Ohio State - 8, Georgetown - 22)
2008 - 32 (UCLA - 1, North Carolina - 3, Kansas - 5, Memphis - 23)
2002 - 34 (Maryland - 1, Kansas - 9, Indiana - 10, Oklahoma - 14)
2009 - 34 (North Carolina - 1, Michigan State - 4, Connecticut - 5, Villanova - 24)
1992 - 38 (Duke - 1, Michigan - 3, Indiana - 5, Cincinnati - 29)
1987 - 42 (Indiana - 6, UNLV - 10, Syracuse - 12, Providence - 14)
1980 - 44 (UCLA - 4, Louisville - 5, Purdue - 11, Iowa - 24)
2005 - 44 (Michigan State - 4, North Carolina - 5, Illinois - 16, Louisville - 19)
1982 - 56 (North Carolina - 1, Louisville - 2, Houston - 14, Georgetown - 39)
1985 - 60 (Georgetown - 1, Memphis - 12, Villanova - 14, St. John's - 33)
1995 - 62 (Arkansas - 1, North Carolina - 2, UCLA - 15, Oklahoma State - 44)
2000 - 68 (Michigan State - 1, North Carolina - 2, Florida - 6, Wisconsin - 59)
1998 - 90 (Kentucky - 1, North Carolina - 1, Utah - 32, Stanford - 56)
2003 - 90 (Kansas - 1, Syracuse - 7, Marquette - 26, Texas - 56)