The science behind optimism, healthy ageing and longevity
When we think about living a longer, healthier life, the focus tends to be on familiar factors: exercise, nutrition, sleep, cardiovascular fitness, metabolic health and preventative medicine.
But longevity research is increasingly looking beyond conventional biomarkers to understand how psychological wellbeing may influence the way we age.
One particularly intriguing area is optimism.
Large observational studies suggest that people with a more optimistic outlook tend to live longer and may be more likely to reach exceptional old age. The important question for longevity medicine is why, and whether optimism itself is something we can meaningfully influence.
Optimism and longevity: what does the research show?
One of the most compelling studies was published in the Proceedings of the National Academy of Sciences in 2019.
Researchers analysed two long-running cohorts of men and women and found that greater optimism was associated with an 11–15% longer lifespan, on average, as well as greater odds of reaching 85 years or older. These relationships persisted after accounting for socioeconomic status, health conditions, depression, social integration and health behaviours.
A subsequent study involving 159,255 women from the Women’s Health Initiative produced similarly interesting results.
After adjustment for demographic factors, chronic conditions and depression, women in the highest quarter for optimism had an estimated 5.4% longer lifespan than those in the lowest quarter. The researchers also found an association between greater optimism and reaching 90 years of age.
The finding isn’t confined to individual studies. A 2022 systematic review and meta-analysis of six prospective studies involving more than 181,000 people found greater optimism was associated with a 13% lower relative risk of all-cause mortality.
These are striking findings. But they need to be interpreted carefully.
Association does not prove causation
We cannot conclude from this research that becoming more optimistic will add a specific number of years to someone’s life. Optimism may be intertwined with other characteristics and circumstances that influence health.
Why might optimism influence healthy ageing?
One possibility is behavioural.
Optimistic people may be more likely to believe that their actions can improve their future, and therefore be more motivated to exercise, eat well, avoid smoking or follow preventative medical advice.
Research offers some support for this idea. A meta-analysis examining physical activity, diet and smoking found that greater optimism was associated with healthier behaviours, although the effects were modest and much of the underlying evidence was cross-sectional.
Behaviour, however, does not appear to tell the whole story.
In the Women’s Health Initiative research, lifestyle factors accounted for approximately 24% of the association between optimism and lifespan in the overall population studied.
Other potential mechanisms, including cardiovascular function and physiological responses to stress, continue to be investigated.
A large systematic review and meta-analysis of 15 studies involving more than 229,000 participants, for example, found optimism was associated with lower rates of cardiovascular events and all-cause mortality. The researchers also noted substantial variation between studies and evidence of possible publication bias, reinforcing the need for careful interpretation.
Can you learn to be more optimistic?
This is where the research becomes particularly interesting.
Optimism is influenced by personality and other factors, but evidence suggests that aspects of optimistic thinking are modifiable rather than entirely fixed.
One of the best-studied approaches is called the Best Possible Self exercise.
The principle is simple: imagine a realistic future in which important areas of your life have gone as well as possible after you have worked towards your goals, then write about that future in detail.
A systematic review and meta-analysis of 29 studies involving 2,909 participants found that this intervention produced improvements in optimism, wellbeing and positive affect compared with control conditions.
That doesn’t mean positive thinking is a longevity treatment.
There is currently an important gap between showing that optimism can be increased psychologically and demonstrating that deliberately increasing optimism subsequently extends human lifespan.
The latter has not been established.
The aim isn’t blind positivity
From a medical perspective, optimism shouldn’t mean ignoring symptoms, dismissing risk or assuming everything will be fine.
A more useful idea is realistic optimism.
This means acknowledging genuine risks while maintaining the belief that our actions can meaningfully influence our future health.
That philosophy sits comfortably alongside preventative and longevity healthcare.
Finding that someone has elevated cardiovascular risk, for example, needn’t be viewed purely negatively. Identifying risk creates an opportunity to act: improving blood pressure, cholesterol, metabolic health, body composition, fitness, sleep and other modifiable factors where appropriate.
In that sense, optimism isn’t about pretending risk doesn’t exist. It is about believing that the future is worth investing in.
What does this mean for longevity medicine?
Modern longevity medicine is ultimately concerned with more than extending lifespan. The objective is to preserve healthspan, the years of life spent in good physical and cognitive health.
Exercise, nutrition, sleep, metabolic and cardiovascular health, avoiding tobacco, appropriate screening and evidence-based preventative medicine remain central to that goal.
But health does not exist independently of psychology.
How we perceive our future may influence the behaviours we sustain, the way we respond to setbacks and potentially some of the biological pathways involved in long-term health.
The evidence does not yet justify prescribing optimism as a longevity intervention. It does, however, suggest something worth considering, a comprehensive approach to healthy ageing may need to pay attention not only to the body we hope to have in the future, but to how we think about that future today.