Aspects of this topic are discussed in the following places at Britannica.
...the large units, kinship is only an ancillary principle of association, supplementing more important ties based on shared membership of a generation class, or age-set. According to the so-called gada system, all the Oromo male children of the same generation formed an indissoluble fraternity; and, as members of this fraternity, they moved through the various stages of life and positions...
in Ethiopia: The Age of the Princes )...people who inhabited the upper basin of the Genalē (Jubba) River in what is now southern Ethiopia and northern Kenya. Oromo society was based upon an “age-set” system known as gada, in which all males born into an eight-year generation moved together through all the stages of life. The warrior classes (luba) raided and rustled in order to prove themselves, and...
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