The Maasai people social organization systems is based on age-set, clans and politically independent Iloshon or locations. The traditional Maasai  system of government is decentralized , with every age-set of every section(Olosho) having its own elected political as well as ritual leaders(inkasisin o Losho). Maasai young males are recruited into an age-set according to their approximate age and initiation(circumcision time). Each age-set normally organizes and regulates its age-set matters independently. Age-sets are very important in the Maasai society. Below is the list of the most recent age-sets.

1. Irratanya
2. Ilpetaa
3. Isalaash
4. Ilmeirishari
5. Ilkidotu
6. Iltuati
7. Inyankusi
8. Ilaimer
9. Iltalala
10. Iltuati
11. Iltareto
12. Ilterito
    1. IloshoroI
    2. Ilmadidani
13. Ilnyankusi
    1. Ilkalikal
    2. Ilkamaniki
14. Ilterekeyiani
    1. Iseuri
    2. Iltiongoni/
15. Ilkitoip
    1. Irrambaun
    2. Irangirang
16. Irkishiru
    1. Ilkipale/Ilkishili
    2. Ilmajeshi
17. Ilmeruas