Early-Versus Late-Onset Alzheimer's Disease: More than Age Alone
Abstract
Alzheimer's disease (AD) is the most common cause of dementia at older age. Although less prevalent before the age of 65 years, it is still the most frequent cause of early-onset dementia followed by frontotemporal dementia. The typical presentation of AD is memory dysfunction, however, presentations with prominent cognitive impairment in other domains besides memory, like prominent apraxia, language problems, or executive dysfunction, may occur and are relatively more common in early-onset AD. In this retrospective descriptive study, we determined the prevalence of non-memory presentations in a large sample of early-onset AD patients compared to late-onset AD. The clinical files of 270 patients with AD starting before the age of 65 years and 90 patients with late-onset AD ( 65 years) were reviewed to assess clinical characteristics. Patients were classified as memory presentation and non-memory presentation according to their clinical presentation. The mean age of the early-onset group was 56 +/- 5 years and 74 +/- 6 years for the late-onset group. A third of the early-onset AD group presented with non-memory symptoms compared to only 6% in the late-onset group (p < 0.001). Within the group with non-memory presentations, apraxia/visuospatial dysfunction was the most prevalent presenting symptom (12%). Patients with early-onset AD often present with a non-memory phenotype, of which apraxia/visuospatial dysfunction is the most common presenting symptom. Atypical presentations of AD should be considered in the clinical differential diagnosis of early-onset dementia.
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Early-onset Alzheimer's disease is marked mainly by severe praxis, executive, and language impairment rather than memory loss.
“Regarding Alzheimer's disease, the most common variety found at a younger age (followed by frontotemporal dementia), earlyonset forms are characterized at the neuropsychological level primarily by severe praxis and executive and language impairment rather than memory loss.11”
From The Unique Experience of Spouses in Early-Onset Dementia (2013) · cites this paper as [11]
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“atrophy patterns depend mostly on the age of onset of AD [27], the AD group was separated into Early-onset”
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- Authors
- Koedam, E. L. G. E., Lauffer, V., van der Vlies, A. E., van der Flier, W. M., Scheltens, P., & Pijnenburg, Y. A. L.
- Affiliations
- Amsterdam UMC Location Vrije Universiteit Amsterdam (NL)
- GGZ inGeest (NL)
- Alzheimer Centre and Department of Neurology, VU University Medical Centre, Amsterdam, The Netherlands
- Venue
- Journal of Alzheimer's Disease
- Publisher
- SAGE Publications
- Published
- 2010-03-11
- Volume
- 19
- Issue
- 4
- Pages
- 1401-1408
- ISSN
- 1387-2877 (ISSN-L)
- 1875-8908
- OpenAlex
- W1486380975
- Cited by
- 452
- References
- 42
- Citations by year
- 2026: 20 · 2025: 26 · 2024: 38 · 2023: 29 · 2022: 35 · 2021: 44 · 2020: 37 · 2019: 29 · 2018: 17 · 2017: 32 · 2016: 23 · 2015: 34 · 2014: 21 · 2013: 30 · 2012: 22
- FWCI
- 14.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Alzheimer s Disease (publishedVersion)
- PubMed (publishedVersion)
- Amsterdam UMC (VU Amsterdam) - Institutional Repository (publishedVersion)
- Pure Amsterdam UMC (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- Funders
- Vanderbilt University Medical Center
- Stichting Dioraphte
- Alzheimer Nederland
- FONDATION ALZHEIMER
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Social Sciences › Psychology › Clinical Psychology › Historical and Modern Theater Studies
- Keywords
- early-onset Alzheimer's disease, late-onset Alzheimer's disease
- MeSH terms
- Age Factors, Aged, Alzheimer Disease, Brain, Female, Humans, Male, Memory Disorders, Middle Aged, Neuropsychological Tests, Severity of Illness Index, Age of Onset
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