Though most elite clubs usually set out to find an up-and-coming head coach or manager whenever there's a vacancy, the majority end up going for someone well into their 40s or 50s.
There are pros and cons to either approach. Whereas young promising coaches in their 30s often have fresher ideas, take greater tactical risks and connect better with millennial players, a more experienced leader will have found a formula that works through trial and error. The pressures of the media, criticism from fans and how to do deal with a demanding owner might also be better faced with some prior knowledge.