This hub brings together what the research says about how we age, how to measure it, the habits with the strongest evidence, and the emerging science worth watching. Explore the clusters below to go deeper into biological age, cellular health, longevity habits and more.
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Quick facts
- Core goal
- Extend healthspan
- Hallmarks of aging
- 12 (2023 update)
- Lifespan heritability
- Estimated < 10%
- Top lever
- Fitness & strength
Definition
What is longevity?
Lifespan is how long you live. Healthspan is how long you live in good health — free from serious chronic disease and disability. Much of modern longevity science aims to close the gap between the two, so that more of your years are good years.
Scientists describe aging through a set of interconnected hallmarks of aging — including genomic instability, telomere attrition, epigenetic alterations, loss of protein balance, disabled autophagy, deregulated nutrient sensing, mitochondrial dysfunction, cellular senescence, stem-cell exhaustion, altered cell communication, chronic inflammation and gut dysbiosis. Many everyday habits influence several of these at once.
Why it matters
Why longevity matters — and why it's mostly in your hands
Genes matter, but less than many people assume. A large analysis of genealogical records estimated that the true heritability of human lifespan is well below 10% once shared family environments are accounted for. Lifestyle, environment and access to care account for much of the rest.
In a major U.S. analysis, adults who maintained five low-risk habits — never smoking, a healthy body weight, at least 30 minutes a day of moderate-to-vigorous activity, moderate alcohol intake and a high-quality diet — had an estimated 12–14 more years of life expectancy at age 50 than those with none. The fundamentals compound.
At a glance
Key takeaways
- Healthspan — years lived in good health — is the real target of longevity science.
- Genetics explain a relatively small share of lifespan; habits and environment explain much more.
- Cardiorespiratory fitness and muscle strength are among the strongest predictors of healthy aging.
- Sleep, diet quality, not smoking, moderate alcohol and social connection round out the foundations.
- Many headline longevity interventions (NAD+ precursors, senolytics, rapamycin) remain early in human research.
The pillars of longevity
If you only focus on a handful of things, make it these. They're supported by decades of observational research and, where tested, clinical trials.
- Move daily and train both your engine (cardio fitness) and chassis (strength, balance).
- Sleep 7–9 hours on a consistent schedule. See sleep optimization.
- Eat mostly minimally processed foods built around plants and adequate protein.
- Don't smoke, and limit alcohol.
- Nurture relationships and a sense of purpose.
- Manage chronic stress with recovery practices. See resilience.
- Stay proactive with screenings, labs and, if useful, genetic insight.
Fitness: the most powerful longevity lever
In a study of more than 120,000 adults who underwent treadmill testing, higher cardiorespiratory fitness was associated with lower long-term mortality — with no observed upper limit of benefit. Low fitness carried a risk comparable to or greater than traditional risk factors such as smoking and diabetes.
Muscle strength matters too: grip strength and leg strength are consistently associated with healthier aging and independence. A practical target for most adults is regular aerobic activity (including some harder efforts) plus strength training two to three times per week.
Measuring how you're aging
You can't manage what you don't measure. These are commonly discussed markers — review them with your clinician.
- Biological age estimates from epigenetic or blood-based clocks — see biological age.
- Fitness markers: VO₂ max (or estimates), resting heart rate, walking speed.
- Strength markers: grip strength, chair-stand or push-up capacity.
- Metabolic markers: fasting glucose or HbA1c, lipids including ApoB, blood pressure, waist circumference.
- Inflammation: high-sensitivity CRP.
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Promising vs. unproven longevity trends
Longevity is full of exciting research — and marketing that runs ahead of it. Our evidence snapshot rates popular approaches. The short version: prioritize the fundamentals, and treat newer interventions as experiments with limited human data. Prescription drugs studied for aging, such as metformin and rapamycin, should only be discussed with a physician.
Evidence snapshot
What the research supports — at a glance
Our editorial rating of the current human evidence. Ratings summarize research quality, not personal suitability.
Regular exercise & fitness
StrongConsistently linked with lower mortality and better function across large studies and trials.
Not smoking
StrongAmong the most powerful modifiable factors for lifespan and healthspan.
7–9 hours of sleep
StrongShort and irregular sleep are associated with worse metabolic, cardiovascular and cognitive outcomes.
Mediterranean-style eating
StrongPlant-rich, minimally processed patterns show benefits in observational studies and trials.
Social connection
ModerateStrong relationships are associated with lower mortality risk in meta-analyses.
Regular sauna use
ModerateObservational data link frequent sauna bathing with favorable outcomes; causality is unclear.
NAD+ precursors
EmergingRaise NAD+ levels in humans; meaningful long-term benefits are not yet established.
Rapamycin, metformin, senolytics
EmergingActive research areas; prescription-only and not proven for aging in healthy people.
The bottom line
Longevity is built on unglamorous consistency: fitness and strength, sleep, diet quality, not smoking, limited alcohol, strong relationships and proactive care. Measure what matters, personalize with data, and treat hyped interventions as experiments. Start with our longevity habits or take the wellness assessment to find your first focus.
FAQ
Frequently asked questions
What is the difference between lifespan and healthspan?
What is the single most important thing for longevity?
Can you slow aging?
Do longevity supplements work?
At what age should I start thinking about longevity?
People also ask
More questions people ask
What are the hallmarks of aging?
How much of longevity is genetic?
What do people in Blue Zones do differently?
Is VO₂ max really linked to longevity?
Answers
Related questions
Key terms
Citations
Sources & references
- [1]Impact of healthy lifestyle factors on life expectancies in the US populationLi Y, Pan A, Wang DD, et al.. Circulation, 2018 · Cohort studyView source : Impact of healthy lifestyle factors on life expectancies in the US population (opens in a new tab)
- [2]Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testingMandsager K, Harb S, Cremer P, et al.. JAMA Network Open, 2018 · Cohort studyView source : Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testing (opens in a new tab)
- [3]The Physical Activity Guidelines for AmericansPiercy KL, Troiano RP, Ballard RM, et al.. JAMA, 2018 · Practice guidelineView source : The Physical Activity Guidelines for Americans (opens in a new tab)
- [4]Hallmarks of aging: An expanding universeLópez-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. Cell, 2023 · ReviewView source : Hallmarks of aging: An expanding universe (opens in a new tab)
- [5]Estimates of the heritability of human longevity are substantially inflated due to assortative matingRuby JG, Wright KM, Rand KA, et al.. Genetics, 2018 · Cohort studyView source : Estimates of the heritability of human longevity are substantially inflated due to assortative mating (opens in a new tab)
Study links open a PubMed search for the exact title, so they keep working even if a journal changes its URL.
