According to the Kalenjin social system, the male sex is divided into boys, warriors and elders.
These age sets played a significant role in traditional Kalenjin society since they were used to record time.
The age of an ipinda sometimes acquired a nickname based on a defining event occurring during their time.
– *La Fontaine states there are eight "age classes" but lists seven names, the order of which is questionable.
[2] Historically, the Nandi had eight cyclical age-sets or ibinwek, however they dropped one for a total of seven.