This essay responds to recent critiques of the U.S. State Department’s inconsistent application of congressionally mandated foreign-aid restrictions following several successful coups d’état in countries receiving USAID foreign assistance. This demographic analysis, which conforms to an age-structural modeling and forecasting protocol that was originally developed for U.S. strategic intelligence efforts, finds: (1.) a disproportionately high level of coup vulnerability (the probability of experiencing a successful coup) among youthful countries (median age equal to or less than 25.5 years), particularly among states in the early-youthful segment of this phase (median age equal to or less than 20.5 years); and (2.) a dramatic one-time decline in coup vulnerability among all phases of the age-structural transition following the end of the Cold War. This essay’s two-decade forecast of an expected gradual decline in coups is consistent with the slow and halting pace of age-structural change that is currently projected by the 2022 revision of the UN Population Division’s medium scenario for countries along the equatorial midriff of Africa, and in parts of the Middle East and southcentral Asia. These findings support an alternative criticism – not of the U.S. State Department’s reluctance to restrict foreign assistance to coup perpetrators, but of currently mandated restrictions that neglect to exempt USAID programs known to advance the age-structural transition (i.e. those that extend girls’ educational attainment, improve access to family planning and other reproductive health services, or expand women’s autonomy and rights).

Fertility decline and a maturing age structure typically prove more indicative of future human development … than do shifts toward economic or political liberalization. Why should it be any different south of the Sahara?

This study adheres to a logistic regression modeling protocol originally developed for long-range intelligence analyses and employs data from UN demographic estimates (the 2024 revision) to generate a set of statistical functions that suggest a moderately strong relationship between increasing median age and the probability of a persistently positive international net migration rate (NMR). According to this relationship, the post-Cold War probability (data from 1990 to 2015) of experiencing a persistently positive net migration rate (defined as a +NMR, directly followed by five consecutive years of +NMRs) rose from less than 0.12 at a population median age of 15 years, to a probability greater than 0.55 at 36 years, and then to more than 0.77 at 45 years. The author hypothesizes a speculative set of predictions aimed at providing long-term tests for this model. These predictions assume that, by a median age of 36.0 years, at least one country in the hypothesized cluster of countries will have shifted to experiencing a series of +NMRs. If, as this model predicts, the age-structurally associated transition to sustained +NMRs transpires by 2055, there could be a substantially larger pool of migrant net-receiving states in parts of Asia, Latin America, and North Africa than the UN’s future scenarios currently project.

This study adheres to a logistic regression modeling protocol originally developed for long-range intelligence analyses and employs data from UN demographic estimates (2024 Revision) to generate a set of statistical functions that suggest a moderately strong relationship between median age and the direction (arithmetic sign) of the international net migration rate (NMR). According to this functional relationship, from 1990 to 2015, the probability of experiencing a persistently positive net migration rate (a +NMR, directly followed by five consecutive years of +NMRs) rose from less than 0.13 at a median age of 15 years, to a probability greater than 0.55 at 36 years, and to nearly 0.78 at 45 years. Assuming that a significant number of countries surpassing a median age of 36 years before 2055 will become continuous migrant net receivers, several countries in Asia, Latin America, and North Africa, for which UN scenarios currently project a continuous series of -NMRs, or a pattern of sign-switching NMRs, will likely experience a continuous series of +NMRs. These results suggest that, by 2055, more of the flow of international migrants could be spread amongst a more varied pool of continuous net-receiving states than the UN’s future scenarios currently indicate.