Baby boomers
show concerning decline in cognitive functioning
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.
"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."