Role of median age

While youth are important in making revolutions happen, older people make it successful.

...political demography research shows that countries with very young age structures are prone both to higher incidence of civil conflict and – most relevant to the outcomes of the Arab Spring – to undemocratic governance. ... The difference in outcomes across the region, according to Richard Cincotta, can be attributed to the fact that as age structures mature, elites become less willing to trade their political freedoms to autocratic leaders in exchange for the promise of security and stability.  

...the initial events following the uprising in Tunisia that quickly spread across the region played out in a neatly linear fashion. Among the five countries where revolt took root, those with the earliest success in ousting autocratic leaders also had the most mature age structures and the least youthful populations. 

In Tunisia, with a median population age of 29, one month passed between a fruit seller’s self-immolation and Zine El Abedine Ben Ali’s flight to exile. In Egypt and Libya, where median age is close to 25 years(identified by Cincotta as a threshold when countries are at least 50 percent likely to be democratic), Hosni Mubarak and Moammar Gaddafi took three weeks and eight months, respectively, to lose their titles. Ali Abdullah Saleh in Yemen (median age 17), took one year to be convinced to formally resign, while in Syria (median age 21), the 15-month uprising continues to be brutally repressed by Bashar Assad’s forces.