Dementia among younger people is rapidly emerging as a global health concern; however, comprehensive research on its shifting burden trends remains insufficient. Data on the prevalence, incidence, mortality, and disability-adjusted life years (DALYs) associated with dementia occurring in individuals <70 years were extracted from the Global Burden of Diseases, Injuries, and Risk Factors Study 2021. Average annual percentage changes (AAPCs) were calculated to assess trends in age-specific rates (ASRs), including age-specific prevalence rates (ASPRs), age-specific incidence rates (ASIRs), age-specific mortality rates (ASMRs), and age-specific DALY rates (ASDRs) while young-onset dementia (YOD) burden trends were analyzed. The correlation between ASR/AAPC and the sociodemographic index (SDI) was evaluated. In 2021, the global prevalence of dementia in individuals <70 years increased by 122.33%, with a 128% increase in new cases since 1990. Concurrently, deaths and DALYs of individuals <70 years with dementia rose by 119.28% and 119.77%, respectively. The AAPCs of YOD ASRs during 1990-2021 initially increased and then decreased with increasing SDI levels, with the highest AAPCs of ASPR (2.20 [95%CI: 2.08-2.32] per 100,000), ASIR (2.25 [95%CI: 2.06-2.45] per 100,000), ASMR (2.04 [95%CI: 1.93-2.15] per 100,000), and ASDR (2.06 [95%CI: 1.99-2.13] per 100,000) observed in middle-SDI levels. Additionally, females <70 years bore a higher burden of dementia globally, and gender differences are still widening. The growth rate of YOD is accelerating, particularly in the middle to high SDI region with females bearing a disproportionately higher burden of YOD. This work was supported by grants from the National High level Hospital Clinical Research Funding, CAMS Innovation Fund for Medical Sciences, and the National Natural Science Foundation of China.
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