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Cognitive aging research has long been shaped by the Seattle Longitudinal Study (SLS), a six-decade investigation into age-related cognitive changes. This narrative review synthesizes SLS findings, emphasizing its five core objectives: elucidating patterns of cognitive decline, identifying onset ages, characterizing individual differences, determining determinants of variability, and evaluating cognitive interventions. Key SLS insights reveal that fluid intelligence (e.g., perceptual speed, reasoning) declines after age 60, while crystallized intelligence (e.g., verbal comprehension) often remains stable or improves. Individual differences are influenced by education, occupation, lifestyle, and health, with cohort effects indicating that newer generations exhibit improved performance, likely linked to societal advancements. Recent studies challenge the generalizability of SLS, highlighting methodological limitations—such as cultural and demographic homogeneity—and questioning the transferability of cognitive training benefits. Contemporary research advances, including neuroimaging and biomarker identification, offer new perspectives on plasticity and resilience, but face challenges related to reproducibility. The review highlights the importance of cross-cultural studies, the integration of multimodal data, and the development of scalable interventions. By critically assessing SLS's legacy and addressing gaps in current literature, this work provides a roadmap for advancing cognitive aging science while acknowledging the complexities of applying historical findings to diverse populations.