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Introduction: Reliable data on the incidence rates for young-onset dementia (YOD) are lacking, but are necessary for research on disease etiology and to raise awareness among health care professionals. Methods: We performed a systematic review and meta-analysis on population-based studies on the incidence of YOD, published between January 1, 1990 and February 1, 2022, according to Meta-analyses of Observational Studies in Epidemiology (MOOSE) guidelines. Data were analyzed using random-effects meta-analyses. Results were age-standardized, and heterogeneity was assessed by subgroup analyses and meta-regression. Results: Sixty-one articles were included. Global age-standardized incidence rates increased from 0.17/100,000 in age 30 to 34 years, to 5.14/100,000 in age 60 to 64 years, giving a global total age-standardized incidence rate of 11 per 100,000 in age 30 to 64. This corresponds to 370,000 new YOD cases annually worldwide. Heterogeneity was high and meta-regression showed geographic location significantly influenced this heterogeneity. Discussion: This meta-analysis shows the current best estimate of YOD incidence. New prospective cohort studies are needed.

Contains fulltext : 245419.pdf (Publisher’s version ) (Open Access) BACKGROUND: There has been growing interest in young people living with dementia. Future research requires consensus on the terminology and operational definition of this group. OBJECTIVE: The purpose of this integrative review was to explore and include all operational definitions used to define dementia at a young age. METHODS: On August 14, 2020, the PubMed, Embase, Cinahl, and PsycInfo databases were searched for empirical and theoretical literature using Google. Various terms to describe and define 'dementia' and 'at a young age' were used to collect literature concerning terminology; age-related aspects, including cut-off ages and criteria; and etiologies of dementia at a young age. RESULTS: The search yielded 6,891 empirical and 4,660 theoretical publications, resulting in the inclusion of 89 publications, including 36 publications containing an explicit discussion and 53 publications as confirmation. 'Young-onset dementia' was the most commonly used term of seven identified terms, in the last two decades. The age of 65 years at symptom onset was used most frequently when considering a total of six upper age limits and four criteria to define a cut-off age. Eight lower age limits and an option for subdivision based on age were included. We identified 251 different etiologies and 27 categories of etiologies. CONCLUSION: Despite relative consensus on the term young-onset dementia and an age at symptom onset being used as a cut-off criterion, much is still unclear concerning possible etiologies of dementia at a young age. In the current study, controversies were detected for discussion in an international consensus study.

This prospective longitudinal cohort study involves a 12-month follow-up period of nursing home residents with dementia. The primary aim of this study is to determine the incidence of behavior complicating intake of food or fluids leading to malnutrition or dehydration. We monitor incident behavior that complicates intake in residents who developed the first symptoms of dementia prior to the age of 65 (young-onset dementia) and in residents who developed dementia after this age (late-onset dementia). Further, we aim to describe the characteristics of these behaviors. Endpoints: 1) Incidence of behavior complicating the intake of food or fluids in nursing home residents with young-onset and late-onset dementia. 2) Description of the characteristics of behavior complicating the intake of food or fluids in nursing-home residents with young-onset and late-onset dementia.