anthropology Anthropology is the scientific study of humanity, concerned with human behavior, human biology, cultures, society, societies, and linguistics, in both the present and past, including archaic humans. Social anthropology studies patterns of behav ...

, an age set is a social category or corporate

social group In the social sciences, a social group is defined as two or more people who interact with one another, share similar characteristics, and collectively have a sense of unity. Regardless, social groups come in a myriad of sizes and varieties. F ...

, consisting of people of similar age, who have a common identity, maintain close ties over a prolonged period, and together pass through a series of age-related statuses. This is in contrast to an

age grade In sociology and anthropology, an age grade or age class is a form of social organization based on age, within a series of such categories, through which individuals pass over the course of their lives. This is in contrast to an age set, to whi ...

, through which people pass individually over time. While a year group or class in a

school A school is the educational institution (and, in the case of in-person learning, the Educational architecture, building) designed to provide learning environments for the teaching of students, usually under the direction of teachers. Most co ...

could be regarded as a simple example of an age set (e.g. 'Class of 2004'), the term is most commonly used to refer to systems in

tribal The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...

societies A society () is a group of individuals involved in persistent social interaction or a large social group sharing the same spatial or social territory, typically subject to the same political authority and dominant cultural expectations. ...

. The phenomenon is most prevalent in

East Africa East Africa, also known as Eastern Africa or the East of Africa, is a region at the eastern edge of the Africa, African continent, distinguished by its unique geographical, historical, and cultural landscape. Defined in varying scopes, the regi ...

, central

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

and parts of

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...

, where in many societies the importance of social groupings based on age eclipses that of social groupings based on

kinship and descent In anthropology, kinship is the web of social relationships that form an important part of the lives of all humans in all societies, although its exact meanings even within this discipline are often debated. Anthropologist Robin Fox says tha ...

. Age sets in these societies are formed by the periodic grouping together of young people—usually men—into a corporate unit with a name and a collective identity. As its members age the set stays together and increases in seniority as older sets die off and new ones are formed beneath it. Age sets and the systems within which they exist can be regarded as either ''cyclical'' or ''progressive''. In a cyclical system there is a finite number of sets and each recurs over the course of a few generations, with new membership. In progressive systems an age set appears once, and when its members have died it ceases to exist. It is often the case that cultures with either cyclical or progressive systems have equivalent ideas about

cosmology Cosmology () is a branch of physics and metaphysics dealing with the nature of the universe, the cosmos. The term ''cosmology'' was first used in English in 1656 in Thomas Blount's ''Glossographia'', with the meaning of "a speaking of the wo ...

and the nature of

time Time is the continuous progression of existence that occurs in an apparently irreversible process, irreversible succession from the past, through the present, and into the future. It is a component quantity of various measurements used to sequ ...

A typical example

South-East African systems provide the classic examples, such as the Zulu

impi is a Nguni word meaning war or combat and by association any body of men gathered for war, for example is a term denoting an army. were formed from regiments () from large militarised homesteads (). In English is often used to refer to a ...

system of fighting

regiment A regiment is a military unit. Its role and size varies markedly, depending on the country, military service, service, or administrative corps, specialisation. In Middle Ages, Medieval Europe, the term "regiment" denoted any large body of l ...

s based on age sets. Keesing (1981) gives the example of the Karimojong of

Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the ...

, 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. As befits the complex nature of many East African systems, Karimojong age sets are themselves grouped into ''generation sets'' consisting of five consecutive age sets. There are four such generation sets in all; each permanently named and recurring cyclically roughly every century. At a given time, two of the generation sets will be active: one junior and one senior. Generation sets are paired in alternate fashion, with two whose members wear

brass Brass is an alloy of copper and zinc, in proportions which can be varied to achieve different colours and mechanical, electrical, acoustic and chemical properties, but copper typically has the larger proportion, generally copper and zinc. I ...

ornaments and are symbolically regarded as yellow, alternating with two whose members wear

copper Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orang ...

ornaments and are symbolically regarded as red. The names of individual age sets are chosen from a stock associated with each pair of generation sets, but do not have a fixed sequence. When most members of a generation set have died off, its surviving age sets are retired and the junior generation set becomes senior. At this point, new initiates become the first members of the next generation set in the sequence. The senior generation set is responsible for initiating new members into the most junior age set of the junior generation set, and each age set is formally subordinate to the one above it. While members of an age set live with their immediate families and local kin groups, and age sets are not tightly organised internally, they serve to apportion roles and status in wider social situations, with senior age sets having a judicial function, for example.Dyson-Hudson, Neville. 1963. "The Karimojong Age System." ''Ethnology'' 2: 353-401. The

Oromo people The Oromo people (, pron. ) are a Cushitic peoples, Cushitic ethnic group native to the Oromia region of Ethiopia and parts of Northern Kenya. They speak the Oromo language (also called ''Afaan Oromoo''), which is part of the Cushitic language ...

and their Gadaa System are also another good example of a society whose social organization resolves around age sets.

A typical example

See also