Skip Holtz would be the obvious nomination. Also Tom Clements. They are 50 and 61 though.
Both come from the Lou Holtz coaching tree.
Skip fits well into the requisite annual 5 losses. In 10 years in Div 1 he's never had less than 5 losses in a season. In those 10 year's 67-61 for a 6.7-6.1 average record. But hey he didn't schedule all 1AA teams himself. Skip does have a signature win over ND while at USF. And, he whomped Rice this year at LAT 76-31. With ND's schedule he won't have to worry about losing again to 1AA Northwestern St.
Tom Clements hasn't lost a game as a head coach anywhere, perfect 0-0. ND has a stellar record with head coaches undergoing OJT, see Brennan, Faust, Weis. But he does have a Super Bowl ring. Hmmm, didn't Weis have a couple of those?