A number of studies have compared Alzheimer’s disease (AD), the commonest form of dementia, based on their age of onset, i.e. before the age of 65 years (early-onset AD, EO-AD) to those developing after 65 years of age (late-onset AD, LO-AD), but the differences are not clear. We performed a systematic review and meta-analysis to compare clinical characteristics between EO-AD and LO-AD.

Medline, Embase, PsycINFO, and CINAHL databases were systematically searched for studies comparing time to diagnosis, cognitive scores, annual cognitive decline, activities of daily living (ADLs), neuropsychiatric symptoms (NPS), quality of life (QoL), and survival time for EO-AD and LO-AD patients.

Forty-two studies were included (EO-AD participants n = 5,544; LO-AD participants n = 16,042). An inverse variance method with random effects models was used to calculate overall effect estimates for each outcome. People with EO-AD had significantly poorer baseline cognitive performance and faster cognitive decline but longer survival times than people with LO-AD. There was no evidence that EO-AD patients differ from people with LO-AD in terms of symptom onset to diagnosis time, ADLs, and NPS. There were insufficient data to estimate overall effects of differences in QoL in EO-AD compared to LO-AD.

Our findings suggest that EO-AD differs from LO-AD in baseline cognition, cognitive decline, and survival time but otherwise has similar clinical characteristics to LO-AD. Larger studies using standardized questionnaires focusing on the clinical presentations are needed to better understand the impact of age of onset in AD.

Exploration of the themes and content of psychotic symptoms in young-onset dementia (YOD) is limited to case analysis. The primary objective of this study was to determine the themes of psychotic symptoms in individuals diagnosed with YOD.

Comprehensive retrospective file review of discharge summaries.

Neuropsychiatry, a specialist mental health service located at the Royal Melbourne Hospital, Australia.

Inpatients at Neuropsychiatry admitted between 2018 and 2020 (inclusive).

Data extracted included descriptions and prevalence of psychotic symptoms as well as general demographic and clinical data. Data analysis was conducted using a thematic approach.

Twenty-three inpatients had a diagnosis of YOD with psychotic symptoms. Themes were identified in the domains of delusions (six themes), auditory hallucinations (five themes), and visual hallucinations (two themes). Strong recurring themes across the modalities of hallucinations and delusions were beliefs and experiences relating to paranoia, suspicion, harm, and abuse. Themes did not clearly intersect across the modalities of hallucinations and delusions. A degree of thematic heterogeneity existed within individuals, and individuals experienced delusions or hallucinations of multiple themes. The themes of the psychotic symptoms did not clearly relate to diagnostic category, nor to time from diagnosis.

This study is the first thematic analysis of psychotic symptoms in YOD and provides further understanding of patient phenomenology and experiences of psychosis in YOD.

The impact of dementia on relationships, intimacy, and sexuality has been documented in later life couples. However, little is known about the experiences of couples living with younger-onset dementia. The aim of this systematic review was to analyze the literature describing the impact of younger-onset dementia on relationships, intimacy, and sexuality in midlife couples.

A systematic literature search was conducted in July 2016 for relevant research papers. Five databases were searched: Web of Science, PsycINFO, MedLine, Scopus, and CINAHL. A quality appraisal checklist was used to assess the methodological quality of included studies.

Eleven studies were identified that explored relationships, intimacy, and sexuality from the perspective of the spouse, the person with dementia or both members of the dyad. Several themes were identified including shifts in roles and responsibilities, declines in relationship quality, changes in identity, and self-esteem, increasing social isolation and loneliness, shifts in intimacy, and changes in sexual activity.

Many of the reviewed studies were subject to a range of methodological issues including small sample sizes, small number of studies, and a reliance on the perspective of only one member of the dyad. Future research should follow couples longitudinally to gain a clearer picture of the impact of younger-onset dementia on the couple relationship over time. The inclusion of people living with younger-onset dementia in research will assist in developing a deeper understanding of the experiences of the individual and dyad.