The original version of this article, by Richard Cincotta, appeared on the National Intelligence Council’s Global Trends 2030 Blog. It is the first post in a series on population aging, featuring Jack Goldstone, Richard Jackson, Jennifer Dabbs Sciubba, Ronald Lee, Andrew Mason, Toshi Yoshihara, Elizabeth H Stephen, David Coleman, and Eric Kaufmann.

This series, Population Aging to 2030, begins with an introductory essay aimed at familiarizing readers with some of the demographic and geographic particulars of this phenomenon, and with several key demographic terms. The term most in need of definition is, of course, “population aging.”

From a demographic perspective, the global distribution of intrastate conflicts is not what it used to be. During the latter half of the 20th century, the states with the most youthful populations (median age of 25.0 years or less) were consistently the most at risk of being engaged in civil or ethnoreligious conflict (circumstances where either ethnic or religious factors, or both, come into play). However, this tight relationship has loosened over the past decade, with the propensity of conflict rising significantly for countries with intermediate age structures (median age 25.1 to 35.0 years) and actually dipping for those with youthful age structures (see Figure 1 below).

Until recently, the question of which countries are at the most risk of violent societal conflict could be answered with a terse, two-part response: “the young and the war-torn.” This simple characterization regarding youth and conflict worked well, until the first decade of the 21st century. The proportion of youthful countries experiencing one or more violent intrastate conflicts declined from 25 percent in 1995 to 15 percent in 2005. What’s behind this encouraging slump in political unrest? One hypothesis is that peace support operations (PSOs) – peacekeepers, police units, and specialized observers that are led, authorized, or endorsed by the United Nations – have made a difference.

This post is a response to the questions and comments that my fellow demographers Elizabeth Leahy Madsen, Jack Goldstone, and Jennifer Dabbs Sciubba put to my recent assessment of Tunisia’s chances for democracy. I’ve divided my response to address the principal questions. (Note: Throughout, “young adults” refers to 15-24 year olds, and “working age population” refers to those between 15-64 years old.)

While events in Tunisia, beginning mid-December and leading ultimately to President Ben Ali’s departure within a month, have rocked the Arab world, they leave an open question: Will Tunisia’s “Jasmine Revolution” ultimately lead to the Arab world’s first liberal democracy? [Video Below]

Whether one supports or finds fault with current (and envisioned) U.S. diplomacy and international development processes and practices, most foreign policy analysts and academics will recognize the first Quadrennial Diplomatic and Development Review (QDDR) as a landmark document. In my opinion, the QDDR – titled Leading Through Civilian Power – is essential reading for those who seek a career in government or who otherwise need to understand the nature and purpose of the work that foreign service officers and USAID missions perform overseas.

After the Berlin Wall came down in 1989, the demand for geostrategic mapping went up. Pentagon geographers revised maps almost monthly in order to keep pace with the rapid sequence of events – the toppling of Eastern Europe’s communist regimes, the rise of pro-Western liberal democracies in their place, and the reunification of Germany. Then came more borders, and even more maps: the breakup of the Soviet Union and the withdrawal of forces from former Warsaw-Pact states, the splintering of Yugoslavia and Czechoslovakia, and requests for accession to NATO. When, in the late 1990s, it became apparent that the end of the Cold War would have little effect on the emergence of civil and ethnic conflicts in Africa, Asia, and Latin America, and that a network of militant Islamist organizations had coalesced across Muslim Asia and Africa, strategic mapmaking shifted focus to identifying conditions in the Global South.

In her recent post on The New Security Beat, Jennifer Sciubba argues that the medium-fertility variant projection published in the UN Population Division’s biennial projections — the source of most future data published in the Population Reference Bureau’s 2010 World Population Data Sheet — forecasts an unrealistically low total fertility rate (TFR) for sub-Saharan Africa in 2050, at a rate of 2.5 lifetime childbirths per woman.