We Are Living Longer...Can We Live Better for Longer?
For most of human history, living longer was itself the ultimate measure of progress.
Medical advances, improved sanitation, vaccination, antibiotics, better nutrition and improvements in socioeconomic conditions have dramatically increased human life expectancy.
The global average life expectancy at birth increased from around 46 years in 1950 to more than 70 years in 2023. By 2050, the global population aged 60 years and older is projected to exceed 2.1 billion [1].
But it creates a new question.
What happens to those additional years?
Living longer does not automatically mean living healthier. The expansion of lifespan has not necessarily been accompanied by an equivalent expansion of healthspan - the years lived in good health and with preserved function. One of the papers reviewed here describes an estimated gap of approximately nine years between lifespan and healthspan [2].
For healthcare professionals, this distinction is increasingly important.
The goal of healthy aging is not simply to postpone death. It is to preserve function, independence, physical and mental well-being, and the ability to participate in life for as long as possible [1,2].
That changes the question from:
"How long can we live?"
to:
"How long can we remain capable of living well?"
Healthy longevity appears to emerge from the interaction of biology, behaviour, environment, healthcare and social circumstances [1,2,3].
The First Shift: From Lifespan to Healthspan
The concept of aging has traditionally been associated with biological decline, increasing disease risk and mortality.
The WHO-oriented definition discussed in the public-health literature focuses on maintaining functional abilities that allow people to experience well-being in older age. Healthy aging therefore goes beyond simply being free from disease. It includes the ability to maintain physical, mental and social well-being and to remain independent within one's environment [1].
This distinction matters because aging and illness are not synonymous.
People can reach advanced ages while maintaining substantial functional capacity. Conversely, a person may experience chronic disease, disability or functional decline long before reaching old age [1].
The public-health article highlights the growing burden of chronic disease and multimorbidity as populations age. Longer lives are increasingly accompanied by conditions such as cardiovascular disease, cancer, diabetes and neurodegenerative disorders, while the coexistence of multiple chronic conditions makes care more complex [1].
This creates what could be called the longevity paradox:
Medicine has become increasingly successful at adding years to life, but the next challenge is ensuring that those years are not dominated by disease, disability and loss of independence [1].
The response proposed is to protect lifespan, which raises another question.
What protects healthspan?
The 5 Key Takeaways Summarised:
Takeaway 1: Longer life does not automatically mean healthier life
The growing gap between lifespan and healthspan makes preservation of function and independence a central goal of healthy aging [2].
Takeaway 2: Exceptional longevity appears to be multifactorial
Multiomics findings point toward an interplay of protective genetics, metabolic health, inflammation, mitochondrial function and other biological safeguards rather than a single mechanism [3].
Takeaway 3: Everyday lifestyle patterns matter
Blue Zone populations demonstrate recurring patterns involving plant-forward diets, regular movement, social connection, stress management and purpose [2,3].
Takeaway 4: Healthy aging starts before old age.
The life-course approach highlights opportunities from the first 1,000 days through adulthood and later life, with prevention and healthy behaviours adapting to each stage [2].
Takeaway 5:Healthy longevity is a societal goal, not only an individual one.
Healthcare systems, public policies, communities and the built environment all influence whether people can age with health, dignity and independence [1].
References:
1. Gianfredi V, et al. Aging, longevity, and healthy aging: the public health approach. Aging Clin Exp Res. 2025.
2. Cocchi C, et al. How to promote healthy aging across the life cycle. Eur J Intern Med. 2025.
3. Kordowitzki P, Ying K. The pursuit of understanding human longevity. npj Aging. 2026.