This year, 2018, marks the 60^th anniversary of a landmark publication by a pair of academic social scientists who first recognized the close relationship between population age structure (the distribution of a country’s population, by age) and development. In Population Growth and Development in Low Income Countries (Princeton U. Press, 1958), demographer Ansley Coale (1917-2002) and economist Edgar M. Hoover (1907-1992) theorized that eventual declines in fertility would transform developing-country age structures. Coale and Hoover demonstrated that these newly transformed age structures would exhibit larger shares of citizens in the working ages, and smaller shares of dependent children and seniors (Fig. 1). This transition, they argued, would someday help lift countries with youthful populations in Asia, Latin America, and Africa out of the low-income bracket.

As populations age, countries around the globe are beginning to focus attention on unpaid caregivers. Such people typically spend hours each day bathing, feeding, and helping an elderly or disabled relative. Often, they undermine their own health and career to take care of a loved one.

While the World Population Prospects—the UN Population Division’s demographic estimates and projections—will never land on anyone’s non-fiction best-seller list, the latest version holds some noteworthy true stories. And the most remarkable demographic story of all may be Bangladesh’s.

Can we save the world one condom (or birth control pill) at a time? The third episode of Everybody Counts, hosted by Jennifer D. Sciubba, a professor of political demography at Rhodes College, makes the case that family planning is the foundation of peace and security by highlighting the links between population growth and political instability.

The silver tsunami is approaching: Many countries, not all of them rich, are facing the challenges of an ageing population thanks to growing life expectancies and shrinking birth rates.

The Kurdish people’s century-long quest for self-determination reveals a key aspect of ethnic separatist conflicts. Ideas of nationhood can endure for generations, unifying people across borders and often making separatist conflicts hard to resolve. But how much harder is it to resolve separatist conflicts than other violent, non-territorial intra-state wars (such as political revolutions)? In practical terms, how much longer, on average, can policymakers expect separatist conflicts to persist and reoccur than the typical political revolution? These are tough questions. Surprisingly, demography helps us find the answers.

“There are more young people in the world today than in any other time in the history of the world,” said Beza Tesfaye, Senior Researcher at Mercy Corps, at a recent event at the U.S. Institute of Peace on Mercy Corps’ efforts to engage youth in Somalia and Afghanistan in order to promote stability and prevent violence. “As we know, marginalized youths are the ones often to be recruited into violent movements. Not only do we have to focus on conflict, but we also have to put youth at the center of development programs to address these issues.”