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Dementia is a leading health policy challenge, with cases expected to triple by 2050, particularly in low- and middle-income countries. Epidemiological evidence demonstrates falling age-specific incidence rates in high-income countries, suggesting risk can be lowered at the population level.The Population-Level Approaches to Dementia Risk Reduction (PLADRR) Research Group is a diverse, international network of researchers committed to investigating how structural, social, and environmental conditions can promote life course brain health and reduce dementia risk across the population.This Policy Forum article sets out the guiding principles of our approach, the building blocks required, our research priorities, and how PLADRR research can inform and translate into policy changes.