Lifespan is how many years you live. Healthspan is how many of those years you spend in good health, able to move, think and do the things you care about. A 2024 Mayo Clinic analysis of World Health Organization data put the gap between the two at 9.6 years worldwide and 12.4 years in the United States.
That gap is why "healthy aging" has become the goal researchers, doctors and plenty of marketers now talk about. This guide explains what each term means, how the gap is measured, what's happening in the body as we age, and what official guidance says actually helps. We sell supplements, so we'll also be straight about where they fit and where they don't.
Last reviewed: October 20, 2026.
Key Takeaways
- Lifespan counts total years lived. Healthspan counts the years lived in good health.
- There's no single agreed definition of healthspan, and no validated test that measures it in one person.
- At the population level, the WHO tracks it as healthy life expectancy (HALE): 62.8 years worldwide in 2023, against a life expectancy of 73.3 years.
- A 2024 study of 183 countries found the healthspan-lifespan gap had widened over two decades. The US gap, 12.4 years, was the largest.
- Scientists group the biology of aging into 12 "hallmarks," most of them studied in cells and animals.
- The levers with the strongest public-health backing are ordinary: regular activity, strength work, enough sleep and a mostly whole-food diet. No supplement has been shown to extend human healthspan.
What is healthspan?
Healthspan is the part of your life you spend in good health. A widely cited definition, quoted by aging researcher Matt Kaeberlein in a 2018 paper, describes it as "the period of life spent in good health" (Kaeberlein, GeroScience, 2018). The same definition also requires being free of the chronic diseases and disabilities of aging.
The word is newer than it sounds. Kaeberlein counted only 14 PubMed papers using "healthspan" or "health span" before 2000. By mid-2018 there were more than 900.
He also pointed out the catch. "Good health" is subjective, health can dip and recover, and there's no agreed line for when a healthspan ends. His conclusion was blunt: there were "no accepted or validated metrics for measuring healthspan." That's worth remembering the next time a product or clinic promises to "extend your healthspan."
What's the difference between lifespan, life expectancy and healthspan?
These terms get mixed up constantly. Lifespan is about one person. Life expectancy and healthy life expectancy are population averages that statisticians calculate from death and health survey data.
| Term | What it measures | Recent figure |
|---|---|---|
| Lifespan | The total years one person actually lives, from birth to death | Individual; no average |
| Life expectancy at birth | The average years a newborn would live if current death rates held | 79.0 years in the US (2024, CDC); 73.3 years worldwide (2023, WHO) |
| Healthspan | The years one person lives in good health | No validated individual test |
| Healthy life expectancy (HALE) | The population average of years lived in full health; time spent ill or disabled is subtracted | 62.8 years worldwide (2023, WHO) |
| Healthspan-lifespan gap | Life expectancy minus HALE: average years lived in less than good health | 9.6 years worldwide; 12.4 years in the US (Garmany and Terzic, 2024) |
So when you see "healthspan" in a headline about a whole country, it usually means HALE. When you see it on a supplement label or a clinic's website, it's being used loosely.
How big is the healthspan-lifespan gap?
The clearest recent numbers come from Mayo Clinic researchers Garmany and Terzic. Their 2024 study in JAMA Network Open used WHO data for 183 member states covering two decades.
They found the gap between life expectancy and healthy life expectancy had widened worldwide, reaching 9.6 years. Women's gap was on average 2.4 years wider than men's. The United States had the largest gap of any country, 12.4 years, which the authors linked to a rise in noncommunicable diseases.
The WHO's own 2023 estimates show the same pattern after the pandemic. Global life expectancy rose to 73.3 years in 2023, nearly matching 73.4 years in 2019. Healthy life expectancy recovered more slowly, to 62.8 years, still 0.4 years below its 2019 level.
Put simply, people are living longer on average, but the extra years aren't all healthy ones. That's the problem the healthspan idea is trying to name.
What happens in the body as we age?
Researchers have tried to organize the biology of aging into a shared framework. The best-known version is the "hallmarks of aging," first published in 2013 and updated in 2023 by López-Otín and colleagues in Cell.
The 2023 update lists 12 hallmarks. To count, a hallmark has to show up with age, speed up aging when researchers make it worse in experiments, and slow aging when they target it. Most of that evidence comes from cells, worms, flies and mice.
| Hallmark | In plain English |
|---|---|
| Genomic instability | DNA damage builds up over time |
| Telomere attrition | The protective caps on chromosomes shorten |
| Epigenetic alterations | The chemical marks that switch genes on and off drift |
| Loss of proteostasis | Cells get worse at keeping proteins folded and working |
| Disabled macroautophagy | Cells get worse at recycling their own worn-out parts |
| Deregulated nutrient-sensing | The signals that tell cells how much fuel is around stop working as well |
| Mitochondrial dysfunction | The cell's energy-producing structures work less efficiently |
| Cellular senescence | Some cells stop dividing but don't die, and they build up |
| Stem cell exhaustion | The cells that replace and repair tissue run down |
| Altered intercellular communication | Signals passed between cells and tissues change |
| Chronic inflammation | A low, persistent level of inflammation tends to rise with age |
| Dysbiosis | The balance of microbes in the gut shifts |
The authors stress that the hallmarks are tied together. Pushing on one affects the others. That's one reason single-target fixes rarely live up to their early hype. For a good example of how a promising lab story got complicated, see our sirtuins explainer.
The framework is useful for science. It isn't a checklist for buying products. A capsule that touches one hallmark in a test tube hasn't been shown to change how a person ages.
Can you measure your own healthspan?
Not with one number, at least not yet. As Kaeberlein noted, health isn't a simple on-off state. It moves up and down through life and generally trends lower with age.
He suggested a future "healthspan index" that scores overall health across many areas, similar to the frailty indices researchers already use. Tracking that score over time would give a fuller picture than a single cut-off date. Nothing like that has been adopted as a standard test.
In practice, the things you and your clinician already track are the useful signals: how far and how easily you can walk, whether you can carry groceries or climb stairs, how you sleep, and your routine checkup results. Consumer "biological age" tests are a separate topic with their own limits.
What actually moves healthspan?
The honest answer is the unglamorous one. The habits with the strongest backing from public health agencies are the same ones you've heard for years. Here's what the guidance says.
| Habit | What the guidance or evidence says | Source |
|---|---|---|
| Aerobic activity | At least 150 minutes of moderate-intensity activity a week, such as 30 minutes a day, 5 days a week (or 75 minutes of vigorous activity) | CDC, Physical Activity Guidelines for Americans |
| Strength work | At least 2 days a week of muscle-strengthening activity | CDC, Physical Activity Guidelines for Americans |
| Sleep | 7 or more hours for adults 18-60; 7-9 hours for ages 61-64; 7-8 hours for 65 and older | CDC, About Sleep |
| Diet pattern | Mostly whole foods: vegetables, fruit, legumes, whole grains, nuts and fish, as in the diets of long-lived populations | See our guide to diet and longevity |
Exercise is also one of the most studied habits in aging research. Our article on the best exercise to increase mitochondria covers how it relates to mitochondria, the energy-producing structures from the hallmarks table.
Food matters too, though the evidence comes mostly from long-term observational studies of whole diets rather than single foods. For practical meal ideas after 60, see nutrition for healthy aging. For the eating patterns of the world's longest-lived people, see what the world's oldest people eat.
Where do supplements fit?
Supplements can help fill gaps in a diet, and some ingredients are being studied for their roles in the biology above. But no supplement has been shown in human trials to extend healthspan or lifespan. Anyone telling you otherwise is ahead of the evidence.
If you're weighing longevity-style products, our no-hype buyer's guide to longevity supplements explains how to judge an ingredient, its dose, its form and the evidence behind it. For specific ingredients, see what NAD+ is and why levels fall with age and our resveratrol guide. For the bigger picture on the science and the scientists, read AI, longevity and David Sinclair.
One example from our own range: OPA Resveratrol 600 mg is a Polygonum cuspidatum root extract standardized to 50% trans-resveratrol, with every ingredient listed on the label. It's a dietary supplement for antioxidant support. It isn't a healthspan treatment, and we don't sell it as one.
OPA Resveratrol 600 mg (30 veggie capsules): 600 mg of Polygonum cuspidatum root extract standardized to 50% trans-resveratrol, about 300 mg of trans-resveratrol per capsule, for antioxidant support. Every ingredient is listed on the label.
Frequently asked questions
What is the meaning of healthspan?
Healthspan is the number of years a person lives in good health. A common research definition is "the period of life spent in good health." In that definition, the period ends when chronic diseases or disabilities of aging set in. There's no single agreed way to measure it in one person.
What's the difference between lifespan and healthspan?
Lifespan is how long you live. Healthspan is how long you stay well. The difference between them is the time spent living with illness or disability, which averages 9.6 years worldwide according to a 2024 analysis of WHO data.
Is lifespan the same as life expectancy?
No. Lifespan is the actual number of years one person lives. Life expectancy is a population average calculated from current death rates. US life expectancy at birth was 79.0 years in 2024, according to the CDC.
What is the average healthspan?
At the population level, the WHO measures healthy life expectancy (HALE). Worldwide HALE was 62.8 years in 2023, compared with a life expectancy of 73.3 years.
How can you increase your healthspan?
The habits with the strongest public-health backing are regular aerobic activity (at least 150 minutes a week), strength work at least twice a week, enough sleep and a mostly whole-food diet. No single product or test has been shown to extend healthspan in people.
Can a supplement extend healthspan?
Not on current evidence. Some ingredients are studied in relation to the biology of aging, but no supplement has been shown in human trials to extend healthspan. If you take medication or have a medical condition, talk to your clinician before starting any supplement.
Sources
- Garmany A, Terzic A. Global Healthspan-Lifespan Gaps Among 183 World Health Organization Member States. JAMA Netw Open. 2024.
- Kaeberlein M. How healthy is the healthspan concept? GeroScience. 2018.
- López-Otín C, et al. The hallmarks of aging. Cell. 2013.
- López-Otín C, et al. Hallmarks of aging: An expanding universe. Cell. 2023.
- World Health Organization. GHE: Life expectancy and healthy life expectancy. Accessed October 20, 2026.
- CDC National Center for Health Statistics. FastStats: Life Expectancy (Mortality in the United States, 2024). Accessed October 20, 2026.
- CDC. Adult Activity: An Overview. 2023.
- CDC. About Sleep. Accessed October 20, 2026.
Disclosure: OPA Nutrition sells supplements, including products mentioned in this article. This content is for education only and is not medical advice. Statements about dietary supplements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Talk to your healthcare provider before using any supplement, especially if you take medication or have a medical condition.
