Age Profiles of Cognitive Decline and Dementia in Late Life in the Aging, Demographics, and Memory Study

Christine E. Walsh, Yang C. Yang, Katsuya Oi, Allison Aiello, Daniel Belsky, Kathleen Mullan Harris, Brenda L. Plassman

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVES: To better understand the temporal dynamics of progression from cognitive decline to onset of dementia in the dementia-free older population in the United States. METHODS: We used longitudinal data from a diverse national population-based sample of older adults (N = 531) in the Aging, Demographics, and Memory Study from the Health and Retirement Study with repeated measures of cognitive function and dementia diagnosis during 12 years of follow-up from 1996 to 2009. We employed joint latent class mixed models to estimate the association between cognitive change and competing risks of dementia and nondementia death and identify heterogeneity in the age profiles of such association adjusting for baseline characteristics. RESULTS: Our analyses found 3 latent classes with distinct age profiles of cognitive decline and associated risk of dementia and mortality: "Rapid Cognitive Decline" (19.6%), "Moderate Progression" (44.6%), and "Optimal Cognitive Aging" (35.8%). When simultaneously accounting for cognitive trajectories and time-to-dementia/death, we also found associations of baseline covariates with slope of cognitive decline (e.g., steeper decline among non-Hispanic Blacks and more educated) and risk of dementia (e.g., greater risk for females and apolipoprotein E-4 carriers, but no difference by education level) that differ substantially from those in separate longitudinal mixed models or survival models. DISCUSSION: The differential age patterns of cognitive decline predicting dementia incidences identified in this study suggest variation in the course of cognitive aging in older adults that may inform future etiological and intervention studies.

Original languageEnglish (US)
Pages (from-to)1880-1891
Number of pages12
JournalJournals of Gerontology - Series B Psychological Sciences and Social Sciences
Volume77
Issue number10
DOIs
StatePublished - Oct 6 2022

Keywords

  • Cognition
  • Joint models
  • Latent class
  • Longitudinal trajectories
  • Mortality

ASJC Scopus subject areas

  • Health(social science)
  • Sociology and Political Science
  • Life-span and Life-course Studies

Fingerprint

Dive into the research topics of 'Age Profiles of Cognitive Decline and Dementia in Late Life in the Aging, Demographics, and Memory Study'. Together they form a unique fingerprint.

Cite this