Analysis of 14 established dementia risk factors in Norwegian population data reveals that comprehensive lifestyle modification could theoretically prevent 52% of dementia cases, with education, hearing loss, and hypertension emerging as the largest contributors to population-attributable risk. The research examined factors including smoking, physical inactivity, excessive alcohol consumption, air pollution exposure, and social isolation across different life stages. This Norwegian validation of the Lancet Commission's risk factor framework represents a significant advancement in dementia prevention research because it demonstrates remarkable consistency across different healthcare systems and populations. While previous risk factor studies focused primarily on Anglo-American cohorts, this Scandinavian analysis confirms that prevention strategies remain viable even in countries with universal healthcare and different demographic profiles. The finding that marital status and occupational factors provide additional protective benefits particularly for women suggests that social determinants may play larger roles than previously recognized. However, the 52% prevention estimate assumes perfect intervention across all factors simultaneously—an unrealistic scenario that highlights the gap between theoretical and practical prevention potential. The research reinforces that dementia prevention requires sustained, multi-domain interventions beginning in midlife, though real-world implementation faces substantial behavioral and systemic challenges.