Baby Boomers Show Concerning Decline in Cognitive Functioning

Summary: Baby boomers scored lower on cognitive function tests than members of previous generations. Scored began to decline in those born between 1948-1953, and decreased further in those born between 1954-1959.

Source: Ohio State University

In a reversal of trends, American baby boomers scored lower on a test of cognitive functioning than did members of previous generations, according to a new nationwide study.

Findings showed that average cognition scores of adults aged 50 and older increased from generation to generation, beginning with the greatest generation (born 1890-1923) and peaking among war babies (born 1942-1947).

Scores began to decline in the early baby boomers (born 1948-1953) and decreased further in the mid baby boomers (born 1954-1959).

While the prevalence of dementia has declined recently in the United States, these results suggest those trends may reverse in the coming decades, according to study author Hui Zheng, professor of sociology at The Ohio State University.

“It is shocking to see this decline in cognitive functioning among baby boomers after generations of increases in test scores,” Zheng said.

“But what was most surprising to me is that this decline is seen in all groups: men and women, across all races and ethnicities and across all education, income and wealth levels.”

Results showed lower cognitive functioning in baby boomers was linked to less wealth, along with higher levels of loneliness, depression, inactivity and obesity, and less likelihood of being married.

The study was published online recently in the Journals of Gerontology: Social Sciences.

Zheng analyzed data on 30,191 Americans who participated in the 1996 to 2014 Health and Retirement Survey, conducted by the University of Michigan. People over 51 years old were surveyed every two years.

As part of the study, participants completed a cognitive test in which they had to recall words they had heard earlier, count down from 100 by 7s, name objects they were shown and perform other tasks.

Other research has shown that overall rates of mortality and illness have increased in baby boomers, but generally found that the highly educated and wealthiest were mostly spared.

“That’s why it was so surprising to me to see cognitive declines in all groups in this study,” Zheng said. “The declines were only slightly lower among the wealthiest and most highly educated.”

Zheng also compared cognition scores within each age group across generations so that scores are not skewed by older people who tend to have poorer cognition. Even in this analysis, the baby boomers came out on bottom.

“Baby boomers already start having lower cognition scores than earlier generations at age 50 to 54,” he said.

The question, then, is what has happened to baby boomers? Zheng looked for clues across the lifetimes of those in the study.

Increasing cognition scores in previous generations could be tied to beneficial childhood conditions – conditions that were similar for baby boomers, Zheng said.

Baby boomers’ childhood health was as good as or better than previous generations and they came from families that had higher socioeconomic status. They also had higher levels of education and better occupations.

“The decline in cognitive functioning that we’re seeing does not come from poorer childhood conditions,” Zheng said.

The biggest factors linked to lower cognition scores among baby boomers in the study were lower wealth, higher levels of self-reported loneliness and depression, lack of physical activity and obesity.

Living without a spouse, being married more than once in their lives, having psychiatric problems and cardiovascular risk factors including strokes, hypertension, heart disease and diabetes were also associated with lower cognitive functioning among people in this generation.

This shows an older lady
Zheng also compared cognition scores within each age group across generations so that scores are not skewed by older people who tend to have poorer cognition. Even in this analysis, the baby boomers came out on bottom. Image is in the public domain.

“If it weren’t for their better childhood health, move favorable family background, more years of education and higher likelihood of having a white-collar occupation, baby boomers would have even worse cognitive functioning,” Zheng said.

There were not enough late baby boomers (born in 1960 or later) to include in this study, but Zheng said he believes they will fare no better. The same might be true for following generations unless we find a solution for the problems found here, he said.

While many of the problems linked to lower cognitive functioning are symptoms of modern life, like less connection with friends and family and growing economic inequality, other problems found in this study are unique to the United States, Zheng said. One example would be the lack of universal access and high cost of health care.

“Part of the story here are the problems of modern life, but it is also about life in the U.S.,” he said.

One of the biggest concerns is that cognitive functioning when people are in their 50s and 60s is related to their likelihood of having dementia when they are older.

“With the aging population in the United States, we were already likely to see an increase in the number of people with dementia,” Zheng said.

“But this study suggests it may be worse than we expected for decades to come.”

About this aging and cognition research article

Source:
Ohio State University
Media Contacts:
Jeff Grabmeier – Ohio State University
Image Source:
The image is in the public domain.

Original Research: Closed access
“A New Look at Cohort Trend and Underlying Mechanisms in Cognitive Functioning” by Hui Zheng, PhD. Journals of Gerontology: Social Sciences.


Abstract

A New Look at Cohort Trend and Underlying Mechanisms in Cognitive Functioning

Objectives
The prevalence of dementia in the United States seems to have declined over the last few decades. We investigate trends and their underlying mechanisms in cognitive functioning (CF) across seven decades of birth cohorts from the Greatest Generation to Baby Boomers.

Method
Data come from 30,191 participants of the 1996-2014 Health and Retirement Study. CF is measured as a summary score on a 35-point cognitive battery of items. We use generalized linear models to examine the trends in CF and explanatory variables across birth cohorts. Then Karlson-Holm-Breen decomposition method is used to evaluate the contribution of each explanatory variable to the trend of CF.

Results
CF has been improving from the Greatest Generation to Late Children of Depression and War Babies, but then significantly declines since the Early-Baby Boomers and continues into Mid-Baby Boomers. This pattern is observed universally across genders, race/ethnicities, education groups, occupations, income and wealth quartiles. The worsening CF among Baby Boomers does not originate from childhood conditions, adult education, or occupation. It can be attributed to lower household wealth, lower likelihood of marriage, higher levels of loneliness, depression and psychiatric problems, and more cardiovascular risk factors (e.g., obesity, physical inactivity, hypertension, stroke, diabetes, and heart disease).

Discussion
The worsening CF among Baby Boomers may potentially reverse past favorable trends in dementia as they reach older ages and cognitive impairment becomes more common if no effective interventions and policy responses are in place.

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  1. Our food, water and air is increasingly devalued.Our water is increasingly from rain fed reservoirs ,reduced Lithium and other mineral content rather than bore holes.Bottle water other than spring water has all minerals removed by reverse osmosis.See the effect of reduced magnesium in water in Israel.
    The real concern is in my mind is reduced Lithium intake from natural sources.
    Just Google Lithium association and depression,dementia,violence ,rape,suicide,cutting,etc.
    The addition of Fluoride to our water to prevent cares blocks the absorption of any Lithium.

  2. It’s nice to reply in this world of forced one way opinions.The earlier reply by Mrs Beevers is near the mark.Her comments on Fluoride is important as it binds to Lithium reducing its intake into the body.
    Lithium is one of the most important minerals and our sources are decreasing and thus I believe it accounts for spectrum of illnesses from Dementia, suicide ,violent crime,etc.etc. See the published work that is ignored ,it is distressing.
    No patent,No profit,No interest.

  3. I would agree with the above comment, but would also add the change and decline in nutrition since the war must also be a significant factor. We’re well aware of chemicals being added to water supply, such as fluoride and medication (from sewage), but with artificial fertilizer and pesticide use increasing, along with antibiotics and unnatural animal feeds e.g. corn fed chickens, beef fed with cattle cake instead of their proper diet of grass, along with polluted river and seawater resulting in contaminated fish, much of our food internationally is now nutritionally lacking. Soil has been depleted of natural mineral content. As a result, we’re all eating much poorer diets, and have been deceived into believing lies about fats and cholesterol which have caused increased levels of heart disease. It’s logical that this would also cause reduced brain nutrition. I would recommend reading ‘Nutrition and Physical Degeneration: A Comparison of Primitive and Modern Diets and Their Effects’, by Weston Price, in 1939.

  4. The problem is caused by the drugs and their use across the board for high blood pressure and high cholesterol. Doctors are routinely putting patients on drugs that lead to complications and eventually impaired brain functioning. When I was 60years old I told my doctor at the time that I was not going to go on drugs that seniors are routinely prescribed. My cognitive functioning has never been ideal, due in part to a hypothyroid condition diagnosed in my twenties. From age 60 to eighty the only medication I was on was natural thyroid. I recently suffered a fainting spell one day and an experience of strong vertigo two days later. I was in the hospital for five days for tests and it turned out that taking too much thyroid. They did find a mitral valve leak. The doctors put me on the traditional drugs for high blood pressure and cholesterol. Two months later I discontinued all meds except thyroid and supplements. In my twenties I was the usual patient believing in the medical profession, not today. I was working up until my hospital stay. I was taking extra thyroid to deal with the pressure at work. I am 81 and a co-worker three years older is still working.

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