Mike Zimmer was 44 when he became an NFL defensive coordinator for the first time in 2000. Tracy Claeys was 42 when he became a defensive coordinator in the Big Ten for the first time in 2011.
Zimmer was creative, motivational and successful in his role for the Dallas Cowboys. There is a story that Cowboys owner Jerry Jones was prepared to hire Zimmer as his head coach in 2003, if he had not been able to convince Bill Parcells to take the job.
That would have put Zimmer in charge of an NFL game as a head coach at 47. Instead, Parcells took Jones' money and Zimmer stayed as defensive coordinator. When Parcells left after the 2006 season, Jones went for Wade Phillips rather than Zimmer.
It would take Zimmer another eight years, and he was 58 when he coached his first NFL game for the Vikings in 2014.
Claeys was the Gophers head coach on an interim basis in 2013 when his boss, Jerry Kill, was having serious problems managing his epilepsy. Claeys' tenure included the Gophers' first four-game winning streak in the Big Ten in 40 years.
Kill was honored as the Big Ten's Coach of the Year in 2014 when the Gophers went 5-3 in the conference. The best part of that team was the toughness, creativity and motivation with which the defense played.
Vikings followers took kindly to Zimmer from the get-go, mostly because of his straight-talking, unsophisticated style. And his popularity has never been greater than at this moment, with his blowoff and then calling out of Rams coach Jeff Fisher after Sunday's overtime victory at TCF Bank Stadium.
On Wednesday, Claeys officially became the Gophers' head coach at age 46, the ninth man to hold that position in the 48 years since Minnesota last shared a Big Ten title (1967).