The terms Old Boys and Old Girls are the usual expressions in use in the United Kingdom for former pupils of primary and secondary schools.
The term is also used for those who attended schools in the Commonwealth realm, a few universities in the UK and, to a lesser extent, schools in Australia, Canada, New Zealand, Republic of Ireland, South Africa and Spain.
Some are based on the name of the founder, such as "Old Wykehamist" and "Old Alleynian" (for old boys of Winchester College, founded by William of Wykeham, and Dulwich College, founded by Edward Alleyn).
Some schools have amalgamated or been renamed through various transformations, but they usually maintain a consistent name for their old boy associations.
Many of these schools have teams that compete nationally in sports such as cricket, rugby union, association football, field hockey and golf, and these teams are usually referred to by the standard Old Boy name, although some also have nicknames.