a typical old couple who are happily married. The names come from an 18th–century poem about such a couple. In Britain, Darby and Joan clubs are social clubs for old people, usually run by charity workers.
DARBY AND JOAN
Meaning of DARBY AND JOAN in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005