Some coaches get their shot with a major club at a relatively tender age (in coaching years, anyway). Barcelona's Pep Guardiola was 37 when he got the gig.

And there are those who get a crack at the big time without ever having played beyond amaetur level, like Aston Villa's Gerard Houllier. There's another, smaller subset which includes those who advanced to top jobs with little or no head-coaching experience, like Real Madrid's Jose Mourinho when he took over at Benfica.

But...