Accelerated Memory Decline in Older Adults without Dementia Identified

Strategic Insights -

A recent study published in the journal Neuroepidemiology has identified a significant rate of memory decline in older adults without a neurocognitive disorder. Conducted by researchers at the University of Southern California, the study analyzed a nationally representative sample of over 2,000 individuals from the Health and Retirement Study (HRS) over a 22-year period. The results suggest that the pace of normative memory decline accelerates with age, with individuals aged 75-84 experiencing a decline of -0.10 standard deviations per year, and those aged 85-94 experiencing a decline of -0.15 standard deviations per year.

Key Takeaways:

  • The study found a significant rate of memory decline in older adults without a neurocognitive disorder, with a pace of decline of -0.05 standard deviations per year on average.
  • The decline in memory was more pronounced in individuals with advanced age, with those aged 85-94 experiencing a decline of -0.15 standard deviations per year.
  • The study highlighted the importance of examining other cognitive domains in future research, as well as the need for more robust measures of cognitive decline.
  • The research was conducted using latent growth curve models, adjusted for baseline age, sex, years of education, and race/ethnicity.
  • The sample was predominantly female (62%), white (86%), and 71 years old on average at baseline.
  • The research suggests that future studies should focus on understanding the mechanisms underlying the accelerated memory decline in older adults without dementia.

Statistics:

  • The rate of memory decline in older adults without a neurocognitive disorder was approximately -0.05 standard deviations per year.
  • The pace of decline accelerated with age, with individuals aged 75-84 experiencing a decline of -0.10 standard deviations per year, and those aged 85-94 experiencing a decline of -0.15 standard deviations per year.
  • The sample was composed of 2,295 individuals at baseline and 263 at the final follow-up wave.

Sources:

  • The Pace of Memory Decline in Older Adults without a Neurocognitive Disorder: Results from 22 Years of Follow-Up in a Nationally Representative Sample. Neuroepidemiology, 2025:1-8.
  • Karger. (n.d.). Neuroepidemiology. Retrieved from
  • NewsRx. Studies Conducted at University of Southern California on Dementia Recently Reported (The Pace of Memory Decline in Older Adults without a Neurocognitive Disorder: Results from 22 Years of Follow-Up in a Nationally Representative Sample). Mental Health Weekly Digest. October 20, 2025; p 1051.