What Is the Gap Between Lifespan and Healthspan?

The findings revealed an important paradox of modern healthcare.

Although people are living longer than they did two decades ago, healthy life is not increasing at the same pace. As a result, the average healthspan-lifespan gap has continued to widen and now approaches 10 years worldwide.

In practical terms, this means that many of the years gained through advances in medicine are not necessarily healthy years. Instead, they are often years lived with cardiovascular disease, diabetes, cancer, musculoskeletal disorders, neurological diseases or other chronic conditions that reduce independence and quality of life.

One of the most striking findings concerned sex differences. Women generally live longer than men, yet they also spend an average of 2.4 additional years living with disease or disability. This larger gap was closely associated with a greater burden of noncommunicable diseases - long-term conditions such as cardiovascular disease, diabetes, cancer and chronic respiratory diseases - rather than with longer lifespan alone.

The study also demonstrated that countries carrying a higher burden of chronic diseases tended to have wider healthspan-lifespan gaps. The United States showed the largest gap—12.4 years—highlighting that a long life expectancy does not automatically translate into better population health.

Importantly, the authors caution that a smaller gap is not always a positive finding. In countries where people die younger, the gap may appear shorter simply because many individuals do not survive long enough to experience prolonged periods of disability.

Overall, the findings suggest that extending lifespan alone is no longer a sufficient measure of progress. The next challenge for healthcare is to delay the onset of chronic disease so that more of the years gained are lived in good health rather than with disability.

For many years, healthcare systems measured success primarily by increasing life expectancy. This study suggests that living longer is no longer enough.

It also helps answer one of the most important questions in longevity medicine: Why doesn't living longer always mean living healthier?

The answer lies in the growing healthspan-lifespan gap. Although medical advances have significantly increased life expectancy, they have not delayed the onset of chronic disease to the same extent. As a result, many people are spending more years living with illness, disability and reduced independence rather than enjoying good health.

This concept is closely related to compression of morbidity—one of the fundamental goals of longevity medicine. Compression of morbidity means delaying the onset of chronic disease so that illness occupies a shorter period at the end of life, allowing people to remain healthy, active and independent for longer.

In other words, the success of modern healthcare should be measured not only by adding years to life, but also by adding healthy years to those additional years.

This study reinforces one of the central principles of longevity medicine: preventing disease is more valuable than simply treating it later.

The healthspan-lifespan gap is not an individual prediction. It is a population measure that shows whether societies are extending healthy life or simply prolonging survival with chronic disease.

For clinicians, this shifts the focus toward earlier identification of cardiometabolic risk, preservation of muscle mass and physical function, maintenance of cognitive health, prevention of frailty and optimisation of lifestyle - long before disease becomes clinically apparent.

Earlier prevention, better chronic disease control and sustained attention to physical and cognitive function are therefore essential if additional years of life are to become additional years of health.

Ultimately, the goal of longevity medicine is not simply to help people live longer, but to help them stay healthier for longer.