Cohorts based on decade of death: no evidence for secular trends favoring later cohorts in cognitive aging and terminal decline in the AHEAD study.

TitleCohorts based on decade of death: no evidence for secular trends favoring later cohorts in cognitive aging and terminal decline in the AHEAD study.
Publication TypeJournal Article
Year of Publication2013
AuthorsHülür, G, Infurna, FJ, Ram, N, Gerstorf, D
JournalPsychol Aging
Volume28
Issue1
Pagination115-27
Date Published2013 Mar
ISSN Number1939-1498
KeywordsAged, Aged, 80 and over, Aging, Death, Epidemiologic Research Design, Female, Health Surveys, Humans, Longitudinal Studies, Male, Memory Disorders, Memory, Episodic, Time Factors, United States
Abstract

<p>Studies of birth-year cohorts examined over the same age range often report secular trends favoring later-born cohorts, who are cognitively fitter and show less steep cognitive declines than earlier-born cohorts. However, there is initial evidence that those advantages of later-born cohorts do not carry into the last years of life, suggesting that pervasive mortality-related processes minimize differences that were apparent earlier in life. Elaborating this work from an alternative perspective on cohort differences, we compared rates of cognitive aging and terminal decline in episodic memory between cohorts based on the year participants had died, earlier (between 1993 and 1999) or later in historical time (between 2000 and 2010). Specifically, we compared trajectories of cognitive decline in 2 death-year cohorts of participants in the Asset and Health Dynamics Among the Oldest Old study that were matched on age at death and education and controlled for a variety of additional covariates. Results revealed little evidence of secular trends favoring later cohorts. To the contrary, the cohort that died in the 2000s showed a less favorable trajectory of age-related memory decline than the cohort that died in the 1990s. In examinations of change in relation to time to death, the cohort dying in the 2000s experienced even steeper terminal declines than the cohort dying in the 1990s. We suggest that secular increases in "manufacturing" survival may exacerbate age- and mortality-related cognitive declines among the oldest old.</p>

DOI10.1037/a0029965
User Guide Notes

http://www.ncbi.nlm.nih.gov/pubmed/23046001?dopt=Abstract

Endnote Keywords

cognitive decline/Cognitive Ability/Episodic Memory/Age Differences/Cohort Analysis/terminal decline

Endnote ID

69318

Alternate JournalPsychol Aging
Citation Key7896
PubMed ID23046001
PubMed Central IDPMC3543759
Grant ListU01 AG009740 / AG / NIA NIH HHS / United States
R21 AG033109 / AG / NIA NIH HHS / United States
U01 AG09740 / AG / NIA NIH HHS / United States
R21-AG033109 / AG / NIA NIH HHS / United States
RC1 AG035645 / AG / NIA NIH HHS / United States
R21-AG032379 / AG / NIA NIH HHS / United States
R24 HD041025 / HD / NICHD NIH HHS / United States
R21 AG032379 / AG / NIA NIH HHS / United States
RC1-AG035645 / AG / NIA NIH HHS / United States