What makes this trend especially notable is that it is not happening to the same extent in many other wealthy countries. In several peer nations, particularly in Nordic Europe, health and well-being during midlife have improved over time rather than declined.

To understand why the United States appears to be moving in a different direction, psychologist Frank J. Infurna of Arizona State University and his colleagues examined survey data from 17 countries.

"The real midlife crisis in America isn't about lifestyle choices or sports cars. It's about juggling work, finances, family, and health amid weakening social supports," Infurna said. "The data make this clear."

The study, published in Current Directions in Psychological Science, points to several factors that may be driving these differences and suggests possible ways to improve outcomes.

Family Support Policies and Loneliness

One key distinction between the United States and many European countries involves support for families.

Since the early 2000s, European nations have increased spending on family benefits, while spending in the U.S. has remained largely unchanged. Compared with Europe, the United States offers fewer programs such as cash assistance for families with children, income support during parental leave, and subsidized childcare.

These policies can have a meaningful impact on people in midlife, who are often balancing careers while raising children and caring for aging parents.

The researchers found that adults in countries with stronger family support systems reported lower levels of loneliness and experienced smaller increases in loneliness over time. In contrast, loneliness among Americans continued to rise across generations.

Health Care Costs Add to the Pressure

The study also points to health care as an important factor.

Although the United States spends more on health care than any other wealthy country, Americans often face greater challenges when it comes to access and affordability. Higher out-of-pocket expenses can strain household finances, discourage preventive medical care, and increase stress, anxiety, and medical debt, according to the authors.

The Role of Income Inequality

Growing income inequality may also help explain why U.S. midlife outcomes differ from those in other countries.

Since the early 2000s, income inequality has increased in the United States, while remaining stable or declining in much of Europe. Previous work by Infurna found that higher levels of inequality are associated with poorer health and greater loneliness among middle-aged adults.

Other research has shown that inequality can increase poverty, reduce opportunities to move up the SES ladder, and limit access to education, employment, and social services. Those disadvantages can ultimately affect both physical and mental health.

Cultural Differences and Financial Vulnerability

The researchers say cultural factors may play a role as well.

Americans are more likely to move frequently and live farther away from family members, making it harder to maintain long-term relationships and caregiving networks.

Economic conditions may also be contributing to the problem. Compared with earlier generations, more recent groups of middle-aged Americans have accumulated less wealth and face greater financial insecurity. Wage stagnation and the effects of the Great Recession are among the reasons cited by the researchers.

In many European countries, stronger social safety nets appear to have helped shield middle-aged adults from some of the negative health consequences associated with economic hardship.

Memory Decline Despite More Education

One of the study's most surprising findings involves cognitive health.

Despite higher levels of educational attainment than previous generations, middle-aged Americans showed declines in episodic memory. The researchers noted that this pattern was not seen in most comparable countries.

"Education is becoming less protective against loneliness, memory decline, and depressive symptoms," Infurna said.

The study suggests that chronic stress, financial insecurity, and higher rates of cardiovascular risk factors may be reducing some of the cognitive advantages typically associated with education.

Can the Trend Be Reversed?

The authors stress that these outcomes are not inevitable.

Personal resources such as strong social support, a sense of control over one's life, and positive attitudes toward aging can help people cope with stress and maintain well-being. However, the researchers argue that broader policy changes will likely be needed to address the underlying causes of the problem.

"At the individual level, social engagement is crucial. Finding community -- through work, hobbies, or caregiving networks -- can buffer stress and improve well-being," Infurna said. "At the policy level, countries with stronger safety nets -- paid leave, childcare support, healthcare -- tend to have better outcomes."