Before revision: Keesing (1981) gives the example of the Karimojong of Uganda, among whom around six age sets are active at any one time, with young adult men being initiated into the most junior, which is closed after five or six years, and a new one formally opened.
After revision: Keesing (1981) gives the example of the Karimojong of Uganda, among whom around six age sets are active at any one time, with young adult men being initiated into the most junior, which is closed after fifty or sixty years, and a new one formally opened.