Youth-dominated demographics are a double-edged sword in development economics. When a large cohort of young people enters a workforce that can absorb them productively, the result is a "demographic dividend" that accelerates economic growth. East Asia's economic miracle was substantially driven by this mechanism, as declining fertility rates in the 1960s-70s created a temporarily favorable ratio of workers to dependents.
Sub-Saharan Africa is entering this window of opportunity, but the conditions for capturing the demographic dividend are far from guaranteed. The region needs to create roughly 20 million formal-sector jobs per year to absorb new labor market entrants. Current job creation rates are a fraction of this. Without productive employment, a youth bulge becomes a source of social tension, migration pressure, and political instability.
Education quality is the critical mediating variable. Countries that invest in education during the demographic transition (as South Korea and Singapore did) convert young populations into productive human capital. Countries where education systems produce graduates without marketable skills face the worst of both worlds: the fiscal burden of a large young population without the economic benefits of a skilled workforce.
Health outcomes are inextricably linked to demographic youth. The youngest-population countries also have the highest child mortality rates, the lowest life expectancies, and the highest disease burdens. Improving health extends productive working lives and reduces the fertility rate (as parents no longer need "insurance births" to ensure some children survive to adulthood).