150+ expert articles, 19 free interactive tools, and clinical protocols covering every dimension of human longevity — from epigenetics to metabolic health.
Longevity science — also called geroscience or healthspan research — is the interdisciplinary study of why humans age and how to slow, prevent, or reverse the biological processes that cause age-related decline. Unlike traditional medicine, which treats diseases after they appear, longevity science targets the upstream mechanisms of aging itself: genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, and altered intercellular communication.
The field has accelerated dramatically since the publication of López-Otín et al.'s landmark 2013 paper identifying the original nine hallmarks of aging (expanded to twelve in 2023). Today, researchers at institutions including the Buck Institute, Harvard's Sinclair Lab, and the Karolinska Institute are conducting human trials on interventions ranging from rapamycin and metformin to NAD+ precursors, senolytics, and GLP-1 receptor agonists — with early results suggesting measurable biological age reversal.
The distinction between lifespan (how long you live) and healthspan (how long you live in good health) is central. The average American lives to 77 but experiences chronic disease by 63 — a 14-year gap of declining quality of life. Closing that gap through evidence-based interventions in exercise, nutrition, sleep, biomarker tracking, and targeted supplementation is the practical mission of longevity science.
First described in Cell (2013, updated 2023), the hallmarks represent the biological processes that drive aging at the cellular level. Each hallmark is a potential therapeutic target.
Three converging breakthroughs have transformed longevity from speculation to measurable science: epigenetic clocks (Horvath, DunedinPACE) now quantify biological age from a blood draw; senolytics and rapamycin have extended healthy lifespan in every model organism tested; and GLP-1 agonists like semaglutide show cardiovascular and metabolic benefits that extend well beyond weight loss. For the first time, we can both measure biological aging and intervene with evidence-backed tools.
Every article is 2,000+ words, peer-reviewed, and built for people who demand evidence.
Each insight below is drawn from peer-reviewed research and explored in depth across our article library.
A 2022 study in JAMA Network Open analyzing over 750,000 exercise tests found that cardiorespiratory fitness (measured by VO₂ max) is a stronger predictor of mortality than smoking, hypertension, or diabetes. Moving from the bottom 25% to just average fitness reduced mortality risk by approximately 50%. Zone 2 training — sustained aerobic exercise at 60–70% of maximum heart rate — is the most efficient method for improving VO₂ max, with as little as 150 minutes per week producing measurable gains. This is why we consider VO₂ max the single most important biomarker for longevity. Read more →
Steve Horvath's 2013 discovery that DNA methylation patterns at specific CpG sites track chronological age within 3.6 years launched the field of epigenetic aging measurement. Second-generation clocks like GrimAge and DunedinPACE go further — they predict mortality and the pace of aging, respectively. This means we can now objectively measure whether an intervention is slowing biological aging, turning longevity from guesswork into a quantifiable science. The DunedinPACE test, available commercially for under $300, measures your rate of aging in real-time and can detect changes from lifestyle interventions within months. Read more →
Cardiovascular disease remains the leading cause of death worldwide, responsible for roughly 18 million deaths annually. Research over the past decade has established that apolipoprotein B (ApoB) — the protein carried by every atherogenic lipoprotein particle — is a far more accurate predictor of cardiovascular risk than traditional LDL cholesterol. A person with normal LDL but elevated ApoB faces significantly higher risk than their standard lipid panel suggests. Mendelian randomization studies have confirmed the causal relationship between ApoB-containing particles and atherosclerosis, making ApoB measurement essential for anyone serious about cardiovascular longevity. Read more →
Research published in Science and Nature has demonstrated that chronic sleep restriction (below 7 hours) is associated with accelerated epigenetic aging, elevated inflammatory markers (hs-CRP, IL-6), impaired glucose metabolism, increased amyloid-beta aggregation (an Alzheimer's risk factor), and disrupted hormonal profiles including reduced testosterone and growth hormone. A 2024 meta-analysis found that each hour of sleep below 7 hours per night was associated with a 13% increase in all-cause mortality risk. Importantly, these effects appear partially reversible: optimizing sleep duration and quality through circadian alignment, light exposure management, and temperature regulation shows measurable improvements within weeks. Read more →
Skeletal muscle functions as a metabolic organ, secreting over 600 myokines — signaling molecules that regulate glucose uptake, inflammation, immune function, and brain health. Sarcopenia (age-related muscle loss) begins around age 30, accelerates after 60, and is independently associated with falls, fractures, metabolic syndrome, cognitive decline, and all-cause mortality. Research shows that resistance training 2–4 times per week, combined with adequate protein intake (1.2–1.6 g per kg bodyweight per day, distributed across meals), can reverse sarcopenia at any age. Grip strength — a simple proxy for total muscle function — predicts mortality more accurately than blood pressure in adults over 50. Read more →
Complex research as clear visuals. Every chart is from peer-reviewed sources.
Where the field stands, what changed this year, and what's coming next — the full landscape in one report.
The articles that matter most. New here? See our guided reading path →
Not theory — implementation. Exact steps, timing, and how to measure outcomes.
What’s optimal at 30 can be counterproductive at 60. Our decade-by-decade guides give you the evidence-based protocol for your age — testing, exercise, nutrition, supplements, and screening.
Self-paced courses with knowledge checks, tool integrations, and progress tracking. No account required.
Every tool is free, requires no account, and grounded in peer-reviewed research.
Longevity content ranges from rigorous to reckless. Here's how we produce ours.
Every claim is grounded in human clinical evidence. Animal studies noted but never the primary basis.
All factual claims sourced to published studies via numbered citations with PubMed identifiers.
Primary sources only — peer-reviewed journals with author, journal, and year.
Resveratrol is Grade D despite being a marketing darling. We follow evidence, not popularity.
Major new trials trigger updates to tools, articles, and evidence grades. Changes are always noted.
No supplement, pharma, or clinic sponsorships. Our evidence grades and editorial positions are not for sale.
We built this because the space was dominated by oversimplified pop-health or expensive gated information.
Whether you're new to healthspan optimization or an experienced biohacker, these are the questions we hear most often.
Chronological age is simply how many years you've been alive. Biological age measures how old your body actually functions — determined by the cumulative wear on your cells, organs, and biological systems. Two 50-year-olds can have dramatically different biological ages: one might have the cellular health of a 40-year-old due to consistent exercise, good sleep, and optimal nutrition, while another might test at 62 due to chronic stress, metabolic dysfunction, and poor sleep.
Biological age is now measurable through several validated methods. Epigenetic clocks (like Horvath's clock, GrimAge, and DunedinPACE) analyze DNA methylation patterns at hundreds of CpG sites to estimate biological age with a margin of error of approximately 3–5 years. Other approaches include telomere length measurement, composite biomarker panels, and proteomics-based aging clocks. Our Bio Age Calculator uses a validated multi-domain model to give you a research-backed estimate.
The interventions with the strongest human evidence, ranked by effect size and quality of research, include: (1) regular aerobic exercise — particularly Zone 2 training to improve VO₂ max, which has the largest mortality reduction of any single intervention; (2) resistance training to maintain skeletal muscle mass and function; (3) sleep optimization — consistently sleeping 7–8 hours with adequate deep sleep and REM; (4) nutritional quality — emphasizing whole foods, adequate protein (especially after 40), and anti-inflammatory patterns like the Mediterranean diet; and (5) stress management and social connection, which have independent, measurable effects on inflammatory markers and epigenetic aging.
On the pharmacological side, metformin, rapamycin, and GLP-1 agonists (semaglutide, tirzepatide) have the most promising human data, though most are still under investigation for longevity-specific endpoints. Our Supplement Evidence Database grades 40+ compounds from A (strong human evidence) to D (insufficient evidence) so you can evaluate each on its merits.
A comprehensive longevity blood panel goes beyond what most primary care physicians order. Key markers include: ApoB (the most accurate predictor of cardiovascular risk), fasting insulin and HOMA-IR (to detect metabolic dysfunction years before diabetes develops), hs-CRP (a marker of systemic inflammation linked to aging), HbA1c (glycated hemoglobin indicating average blood sugar control), homocysteine (elevated levels linked to cardiovascular and cognitive risk), vitamin D (25-hydroxyvitamin D), thyroid panel (TSH, free T3, free T4), a complete metabolic panel, CBC with differential, and sex hormones (testosterone, estradiol, DHEA-S). For those over 40, adding Lp(a) — a genetically determined cardiovascular risk factor — and a coronary artery calcium (CAC) score provides critical risk stratification that standard screenings miss entirely.
Our Complete Bloodwork Guide covers all 38 recommended markers with both standard and longevity-optimal reference ranges, and the Lab Results Interpreter tool helps you understand what your numbers actually mean.
Yes — and the distinction is critical. The "anti-aging" industry is a $60+ billion market that includes everything from face creams to unregulated peptide cocktails, often sold with exaggerated claims and minimal evidence. Longevity science, by contrast, is an established academic discipline with peer-reviewed research, reproducible results, and a growing body of human clinical trial data. The difference comes down to evidence standards: legitimate longevity research requires randomized controlled trials, validated biomarkers, and replicable outcomes. Marketing requires none of those.
IQ Healthspan exists precisely because of this gap. We apply rigorous evidence grading to every claim — and we're equally willing to highlight what doesn't work as what does. Resveratrol, for example, receives a Grade D in our Supplement Database despite decades of marketing hype, because the human trial data simply doesn't support the claims. Our 10 Debunked Anti-Aging Claims article covers the most common misconceptions.
Three things set IQ Healthspan apart. First, depth over breadth: every article is 2,000+ words with numbered citations to peer-reviewed sources — not a 500-word blog post with a supplement affiliate link at the bottom. Second, free interactive tools: our Bio Age Calculator, Lab Results Interpreter, Supplement Evidence Database, and Protocol Builder are research-grade tools that would cost $50–200/month on competing platforms, offered here at no cost. Third, editorial independence: we do not accept sponsorship from supplement companies, pharmaceutical firms, or longevity clinics. Our evidence grades are based exclusively on published research, and we update or revise them when new data emerges — even when that means downgrading a popular compound.
We recommend starting with our Start Here guided reading path, which walks you through the foundational concepts in a logical order. Begin with The 12 Hallmarks of Aging to understand the biology, then read VO₂ Max: The Best Predictor of Lifespan and Sleep: The Foundation Everything Else Is Built On for the two highest-impact lifestyle interventions. Once you have the basics, try the Bio Age Calculator to establish your baseline and the AI Protocol Builder to generate a personalized starting plan based on your age, goals, and current health status.
Curated coverage of new clinical trials, peer-reviewed research, and industry developments — translated into plain language with our evidence lens.