Van Gaal's Whippersnappers

Pronounced "Vippersnappers".

In the traditions of the Busby Babes, Docherty's Dickenses, Sexton's Striplings, Atkinson's Adolescents, and Fergie's Fledglings (some made up):

Manchester United named their fourth-youngest starting XI in Premier League history (23 years, 222 days old on average).

For the sake of post-war completeness, we can add McGuinness's Munchkins, O'Farrell's Offspring, and Moyes's Mites/Moppets (interim managers not included).