A young man's game? That statement is irrational.
Levy was a hall of fame coach at a fairly old age- as was Vermeil, Shula, Schottenheimer, Carson, Parcells, Gibbs, Marchiobroda, etc......
That is just a discriminatory statementmade by people who want to simplify things to absolutes- which always makes statements incorrect.
Young or old,if the person has leadership ability, they will get things done