Optimism is modifiable—that it can be worked on, improved, shifted
A decade-long study of more than 70,000 adults from Boston University has found that optimism — the quiet, daily habit of expecting good things from the future — is associated with living 11 to 15 percent longer and carrying 50 to 70 percent greater odds of reaching age 85. What makes this finding remarkable is not merely its scale, but its persistence: the advantage held even after accounting for the full range of lifestyle and medical variables we typically credit with longevity. In a culture that treats long life as a product of discipline and biology, science is now asking whether the story we tell ourselves about tomorrow may matter just as much.
- A Boston University study of over 70,000 adults found that optimistic people were 50 to 70 percent more likely to reach 85 — a margin that rivals the impact of diet or exercise.
- The effect refused to disappear even when researchers stripped away age, education, chronic illness, depression, alcohol use, and physical activity, suggesting optimism carries independent biological or behavioral weight.
- Researchers believe optimists recover from stress more efficiently and accumulate healthier daily choices over decades — small advantages that compound into years of additional life.
- Because optimism is considered modifiable through therapy and behavioral techniques, scientists see a rare opening: a psychological trait that could become a scalable, teachable public health tool for extending human lifespan.
The familiar pillars of longevity — diet, exercise, sleep — have long dominated the conversation. But researchers at Boston University's School of Medicine have identified something operating in a different register: the basic orientation of hope or resignation a person carries into each day.
The study tracked more than 70,000 adults over time, combining a decade-long cohort of nearly 70,000 women with a three-decade follow-up of roughly 1,400 men. Participants completed surveys on optimism, daily habits, and health status. The results were striking. Those who scored highest on optimism lived 11 to 15 percent longer and had 50 to 70 percent greater odds of reaching 85 — an advantage that persisted even after controlling for age, education, chronic illness, depression, alcohol use, exercise, diet, and medical visits.
Lead author Lewina Lee, a clinical psychologist, emphasized that optimism is not fixed. It can be cultivated through therapy and behavioral techniques — a finding that transforms the result from observation into possibility. If optimism adds years, and optimism can be learned, the implications for public health are significant.
Researchers point to two likely mechanisms: optimists manage stress and emotional setbacks more effectively, and they tend to make healthier daily choices that compound quietly over decades. The study is observational and cannot claim direct causation, but it joins a growing body of evidence — including a Yale study finding that positive views on aging added 7.5 years of life — suggesting that how we think about the future may shape how long we remain in it.
The usual suspects in the longevity conversation are familiar enough: eat well, move your body, sleep enough. But researchers at Boston University's School of Medicine have identified something that operates in a different register entirely—something that may matter just as much, or more. They found that how you see the future, the basic orientation of hope or resignation you carry into each day, correlates with whether you'll make it to 85.
The study, published in 2019, tracked more than 70,000 adults over time. The cohort included nearly 70,000 women followed for a decade and roughly 1,400 men tracked across three decades. Each participant filled out surveys measuring their level of optimism, their daily habits, and their health status. Then the researchers simply watched what happened.
The findings were stark. People who scored highest on optimism measures lived between 11 and 15 percent longer than their more pessimistic counterparts. More striking still: they had between 50 and 70 percent greater odds of reaching 85. This advantage held even when researchers controlled for the variables you'd expect to matter—age, education, existing chronic illness, depression, drinking, exercise frequency, diet quality, and how often someone visited a doctor. The optimism effect remained.
Lewina Lee, the study's lead author and a clinical psychologist, framed the implications carefully but clearly. Optimism, she suggested, represents one of those psychological factors with genuine power to extend human life. And unlike genetics or early childhood circumstances, it's not fixed. Lee emphasized that optimism is "modifiable"—that it can be worked on, improved, shifted through relatively straightforward techniques and therapeutic approaches. That single word opens a door: if optimism adds years, and optimism can be learned, then anyone might extend their own life by changing how they think about what comes next.
The mechanism remains partly opaque. But researchers have developed some working theories. One centers on stress management. Optimistic people, according to Laura Kubzansky, a professor at Harvard's TH Chan School of Public Health, tend to regulate their emotions and behavior more effectively. They recover faster from setbacks and difficulties. They bounce back. Another explanation is simpler and behavioral: optimists tend to take better care of themselves. They exercise more regularly. They're less likely to smoke. Small choices, compounded over decades, add up.
The Boston team was careful to note what their study could and couldn't claim. This is observational research—it shows a relationship, a correlation. It doesn't prove that optimism directly causes longer life. Other unmeasured factors could be at play. The finding is robust, but it's not a causal proof.
The Boston work isn't alone in pointing this direction. A 2002 study led by Becca Levy at Yale examined older adults and their self-perception about aging. Those with a positive view of growing older lived 7.5 years longer than those with a negative view, even after accounting for age, gender, socioeconomic status, and baseline health. The pattern repeats across research: how you think about your future seems to shape how long you're in it.
Notable Quotes
Optimism is one of those psychological factors with genuine power to extend human life, and it can be improved through relatively straightforward techniques and therapeutic approaches.— Lewina Lee, lead author and clinical psychologist
Optimistic people tend to regulate their emotions and behavior more effectively and recover faster from setbacks and difficulties.— Laura Kubzansky, Harvard TH Chan School of Public Health
The Hearth Conversation Another angle on the story
So the study controlled for exercise, diet, medical visits—all the things we think of as the real drivers of longevity. And optimism still mattered?
Yes. It mattered independently. That's what made it noteworthy. You can be someone who exercises regularly and eats well but carries a fundamentally pessimistic view of the future, and the data suggests you're at a disadvantage compared to someone less disciplined but more hopeful.
But how does that work mechanically? Is it just that optimists make better choices we haven't measured?
Possibly. But the researchers point to stress regulation as a real pathway. Optimists don't just bounce back faster from difficulty—they may actually experience less physiological wear from stress in the first place. That compounds over time.
The study says optimism is modifiable. Can you actually teach someone to be more optimistic, or is that wishful thinking?
The lead author was explicit: it can be worked on through therapy and behavioral techniques. Whether that's cognitive reframing, gratitude practice, or something else, the point is it's not a fixed trait. You're not born with your optimism ceiling.
Does this feel like it could actually change public health policy?
That's the implication Lee was making. If optimism is modifiable and it extends life by years, then interventions around it become scalable in a way genetic factors never could be. But you'd need to prove causation first, not just correlation.
What's the gap between what the study shows and what people will actually do with it?
Probably enormous. People want a pill or a protocol. "Be more optimistic" sounds like advice, not medicine. But that's exactly what makes it interesting—it's free, it's available to everyone, and the evidence suggests it works.