Longevity is the length of a long and healthy life. In short, it is not only how many years you live but how many of them are free of serious disease and disability. Science describes that target as "healthspan".
Today longevity research studies the biology of aging (cellular damage, inflammation, mitochondrial function, telomeres) and the ways lifestyle can influence it.
These terms are often confused:
Observational studies and clinical trials most consistently link long, healthy life to the five areas below. They reduce risk; they are not a guarantee of lifespan.
A study by Mandsager and colleagues following more than 120,000 people reported that higher cardiorespiratory fitness was associated with lower mortality, with no clear upper limit to the benefit. VO2 max, the measure of that fitness, is one of the most discussed longevity markers. Strength matters too: grip strength is a simple marker used in aging research.
The World Health Organization recommends at least 150–300 minutes of moderate aerobic activity per week and muscle-strengthening on at least two days. See the movement and exercise guide.
Longevity nutrition means an eating pattern aimed at long-term health: mostly plant-based and low in ultra-processed food. One of the strongest pieces of trial evidence is PREDIMED: a Mediterranean-style diet supplemented with olive oil or nuts reduced major cardiovascular events in people at high cardiovascular risk.
Meal timing is also being studied: circadian eating and autophagy are topics in this field. See the longevity nutrition guide.
A consensus statement from the American Academy of Sleep Medicine and the Sleep Research Society says adults should regularly sleep at least 7 hours for good health. Chronic short sleep is linked to metabolic and cardiovascular risk and to markers of cellular stress. See the sleep and mental health guide.
A meta-analysis by Holt-Lunstad and colleagues pooling 148 studies (about 308,000 participants) found that people with stronger social relationships had roughly a 50 percent greater likelihood of survival. Strong social networks are also common in the world's long-lived communities: Power 9 and Blue Zones and Okinawa. See the social connection and purpose guide.
A 2004 study by Epel and colleagues linked long-term high perceived stress to shorter telomeres. This is an association, not proof of causation, but it points to a link between stress and biological aging. Mitochondrial health and inflammation (inflammaging) are part of the same story.
Other topics get attention in longevity. What matters is separating the level of evidence:
Longevity is the length of a long and healthy life. It is not only how long you live but how many of those years are free of serious disease and disability, which science calls healthspan.
Longevity means long life or long-livedness. Today it also names the field of science that studies the biology of aging and healthy aging.
Lifespan is the total time from birth to death. Healthspan is the part of that time lived without serious disease or dependence. Longevity aims at both.
An eating pattern aimed at long-term health, mostly plant-based and low in ultra-processed food. In the PREDIMED trial, a Mediterranean diet with olive oil or nuts reduced cardiovascular events.
Research highlights regular movement and fitness, balanced nutrition, enough sleep (at least 7 hours for adults), strong social ties and stress management. They reduce risk but do not guarantee lifespan.
Biological age is how worn your cells and organs are, independent of calendar age. Longevity work aims to slow biological aging and extend healthy years.