Mike Tomlin of the Pittsburgh Steelers, Erik Spoelstra was a video coordinator turned head coach he was hired before he was 35
RAIDERS
There is generally only one coach. The others, as not everybody can be the head coach, are usually assistant coaches. In years to come, most become head coaches.
As of right now the Buffalo Bills have had 15 different head coaches.
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Since 1933, the Steelers have had 16 different head coaches.
Through the 2007 season, the Saints have had 14 head coaches. Click on the 'New Orleans Saints Head Coaches' link on this page to see who has coached the Saints and what their all time record was.
Hank Vasconcellos was the head coach of the team for those four years.
The London Wasps rugby team have had various head coaches appointed over the years since the club was established in 1867. Some of the coaches included Rob Smith, Warren Gatland, Tony Hanks, Leon Holden and most currently Dai Young.
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1 head coach (hence the name "head") but can have up to as many 'other' coaches. (abviousley not anything above 10)
One
There are currently 30 head coaches