Boy bishop one of the choirboys formerly elected at the annual ‘Feast of Boys’ in certain cathedrals, to walk in a procession of the boys to the altar of the Innocents or of the Holy Trinity, and perform the office on the eve and day of the Holy Innocents, the boys occupying the canons' stalls in the cathedral during the service. Provision for this is made in the Sarum Office.
The custom dates from the 13th century, and lasted until the Reformation. Boy bishops were appointed also in religious houses and in schools.
never send a boy to do a man's job a young or inexperienced person should not be given work beyond their capacities. Saying recorded from the mid 20th century.
you can take the boy out of the country but you can't take the country out of the boy even when a person moves away from the place they were brought up in, they retain its essential manners and customs. Recorded from the mid 20th century and of North American origin; it has generated a large number of humorous by-forms.
See also boys, all work and no play makes Jack a dull boy.