For decades, the science of aging has been shaped by a relatively narrow set of populations. Much of what we consider “standard” evidence—whether biological, clinical, or social—has been produced in the United States and Europe and implicitly treated as universal.

That assumption is increasingly difficult to sustain. Over the past three decades, the geography of aging research has undergone a profound transformation. As discussed in my recent chapter, “The Emergence of the Global South in Aging Research,” countries across the Global South—most notably China—have expanded their scientific capacity at an unprecedented pace, reshaping the global landscape of knowledge production.

This shift is not only quantitative. It raises a more fundamental question: what counts as valid and relevant evidence in a world where the majority of aging populations live outside the Global North?

1. Rethinking Universality: Why Context Matters

It is tempting to assume that because the biological mechanisms of aging—such as cellular senescence or genomic instability—are broadly shared across humans, the science of aging can be universally applied regardless of context. However, this assumption is increasingly difficult to sustain.

While fundamental biological processes may be similar, their expression and consequences are shaped by environmental exposures, social conditions, and health system capacities. A life course marked by early-life malnutrition, chronic inequality, or environmental stressors can produce outcomes in later life that differ significantly from those observed in high-income settings.

As a result, the “standard of evidence” in aging research must expand beyond narrow population bases. Evidence derived from limited, high-income contexts is no longer sufficient to inform global health policy. Clinical guidelines and interventions that do not account for this diversity risk being systematically biased and less effective across different populations.

1. Diverging Priorities in a Changing Research Landscape

The rise of the Global South in aging research is not a uniform process. Instead, it reflects a diversity of research priorities that correspond to different national and regional contexts.

In countries such as China and India, strong investment in biomedical and clinical research has supported the development of new therapeutic and diagnostic approaches. In contrast, research efforts in regions such as the African Union and parts of Southeast Asia have focused more heavily on health systems, policy, and the social determinants of health. In Latin America and the Caribbean, research portfolios combine biomedical approaches with a distinctive emphasis on frailty and musculoskeletal conditions.

These differences should not be understood as hierarchical, but as complementary. Aging is a complex phenomenon that requires both biomedical innovation and strong health systems and policy frameworks.

However, there is a risk of imbalance. If international funding continues to prioritize technologically intensive biomedical research, other critical dimensions—such as healthcare access, inequality, and system capacity—may be underfunded. This could lead to an overemphasis on medicalized solutions that are difficult to implement in many real-world settings.

1. The Visibility Paradox: Integration Without Erasure

In many parts of the Global South, aging cannot be understood as an isolated biological process. It is closely intertwined with infectious diseases, poverty, and structural inequalities.

In Sub-Saharan Africa, for example, the long-term effects of HIV/AIDS shape aging trajectories in fundamental ways. In Latin America, social inequalities often play a more decisive role in health outcomes than chronological age alone. These dynamics reflect a life course perspective in which later-life outcomes are shaped by cumulative exposures over time.

This creates a policy challenge. On the one hand, aging needs to be integrated into broader health and development agendas. On the other hand, excessive integration risks rendering older populations invisible.

If aging is treated only as a secondary dimension of other policy domains, issues such as frailty, long-term care, and age-specific vulnerabilities may receive insufficient attention. The challenge, therefore, is to integrate aging into broader frameworks while maintaining its visibility as a distinct policy priority.

1. The Prestige Trap and the Problem of Data Invisibility

Despite the growth of research capacity in the Global South, structural inequalities in knowledge production persist.

Academic recognition and funding remain closely tied to publication in journals indexed in systems such as Web of Science and Scopus. These systems tend to privilege research aligned with the priorities of high-income countries, creating what can be described as a “prestige trap.” Researchers are incentivized to pursue topics that are internationally visible, but not necessarily locally relevant.

At the same time, scientific production within the Global South is often concentrated in a limited number of national hubs. Countries such as Brazil, South Africa, and Egypt play a dominant role in their respective regions. While this concentration has enabled rapid growth in research output, it also creates significant gaps.

Large segments of the population—particularly in smaller or lower-capacity countries, as well as rural and marginalized communities—remain underrepresented in the evidence base. This results in a form of data invisibility, where entire populations are effectively excluded from the knowledge used to inform policy decisions.

If international collaborations continue to focus primarily on established research centers, these inequalities may be further reinforced. More inclusive models of collaboration and capacity building are therefore essential to ensure that knowledge production reflects the diversity of aging experiences across regions.

1. Toward Impact-Driven Aging Research

The ongoing realignment of aging research offers a critical opportunity to rethink how scientific knowledge is produced and used in global health.

However, increased research volume alone is not sufficient. Without changes in evaluation systems, funding priorities, and publishing infrastructures, existing asymmetries may persist in new forms.

A shift toward impact-driven research is needed. This includes expanding evaluation criteria to recognize context-relevant research, strengthening regional publishing platforms such as Diamond Open Access initiatives, and promoting forms of international collaboration that prioritize local capacity building and public health relevance.

As argued in “The Emergence of the Global South in Aging Research,” the future of aging science depends not only on who produces knowledge, but on how that knowledge is valued and applied.

Policy takeaway: Moving from prestige-driven to impact-oriented evaluation systems is essential to ensure that aging research contributes meaningfully to global health equity. This requires aligning scientific incentives with the needs of diverse populations and recognizing the Global South not as a peripheral contributor, but as a central actor in shaping the future of aging research.

Fajardo-Ortiz, D., Sipido, K.R. (2024). The Emergence of the Global South in Aging Research. In: García-Peña, C., Pérez-Zepeda, M.U., Gutiérrez-Robledo, L.M., Garcia-Chanes, R.E. (eds) Aging Research—Methodological Issues. Springer, Cham. https://doi.org/10.1007/978-3-031-76469-1_11