21 or 23 is too young for a Chief's position in any department. There is something called experience that can only be gained over time. A good chief needs to have experience not only on the fire-ground but with handling their personnel, community relations, budgets, and fund raising, apparatus, politics and more. The chief is also the person that carries the most responsibility for their Department (i.e. legally). I certainly appreciate and respect younger officers as I once was one. But, the path to becoming a chief should be a gradual, trained and experienced position.