Add years to your life. And life to your years.
Most longevity advice sells you the expensive molecule and skips what actually moves the needle. Here is what the evidence supports, what to skip, and how to find out what works for your body.
- ✓ Evidence-graded
- ✓ No wearable required
- ✓ Test it on yourself
The reality
The gap between living and living well is measurable.
Longevity is the practice of extending both lifespan and healthspan. It targets the rate of biological aging, not the calendar. Three numbers show why that matters.
The healthspan gap
U.S. life expectancy runs to roughly 78 years, but healthspan ends near 66. That is a decade-plus spent in declining health (Nature Aging, 2021).
Fitness beats lab markers
In a cohort of 122,007 patients, cardiorespiratory fitness was inversely tied to mortality with no upper limit of benefit (JAMA Network Open, 2018).
Strength is a clock
The weakest 20% by grip strength carried roughly 2.2 to 2.5 times the all-cause mortality risk of the strongest (Scientific Reports, 2024).
How to think about it
Stop chasing molecules. Start collecting answers.
The interventions with the strongest human evidence are unglamorous. The 2024 DO-HEALTH trial showed omega-3, vitamin D, and strength training each slowed DNA-methylation aging clocks, and the effect stacked (Nature Aging, 2024). The boring inputs compound.
Chase the rate of aging
Build muscle and aerobic fitness, defend sleep, lower chronic inflammation, and keep blood sugar stable. These move the needle more than any pill.
Strongest human evidence · Free and cheap
Score it before you buy it
Run every candidate through BioHarmony, our framework for rating any biohack on evidence, effect size, safety, and cost, so marketing does not earn a spot.
Downsides weighted as heavily as upsides
Earn the skepticism back
Treat live-to-120 marketing carefully. Many supercentenarian records trace to missing birth certificates and pension fraud (UCL, 2024 Ig Nobel).
Optimize from verifiable biology
Assess, don’t guess
The most compelling research describes the average response of a group. The intervention that works in a trial may do nothing for you. So if you decide to test something here, don’t guess whether it is working. Run a personal n=1 experiment in Outliyr, test it against your own baseline, and get a keep-it-or-drop-it verdict graded by how strong the evidence is for you specifically. That is the whole point of the platform: verification instead of description.
Start your free profile →Go deeper
Explore longevity by sub-topic
The field breaks into a handful of levers. Pick where you want to go deeper.
Biological age & aging clocks
Your birthday is fixed. Your biological age is not.
Slow your aging → 🧬The hallmarks of aging
The root mechanisms every intervention ultimately targets.
See the mechanisms → 💊Supplements that earn it
Most do not. A few have real human data.
See what works → ⚡NAD+ & cellular energy
The most-marketed lever, with messier evidence than the ads suggest.
Get the truth → 🧪Geroprotector drugs
Rapamycin, metformin, senolytics. Promising in animals, unproven in humans.
Read the reports → 🔁Daily habits that compound
The free inputs that out-predict any pill.
Get the habits →Scored, not marketed
BioHarmony scores for key interventions
Each one rated on evidence, effect size, safety, and cost. Tap any to read the full report.
Field notes
Longevity pro tips
The high-impact principles I come back to, distilled.
Train, track & build
- Muscle mass, strength, walking speed, the ability to sit and stand unassisted, and VO2 max are among the best predictors of longevity. Track them.
- Strength training beats steady-state chronic cardio for longevity. Pair it with frequent low-level activity, like walking.
- Stress and inflammation are two primary accelerators of biological aging.
- Maintain balanced insulin through diet and lifestyle.
- Small 1% improvements compound into a drastically different quality of life decades later.
- The earlier you start, even young, the easier the process and the better you look, feel, and perform.
Recover, replace & sustain
- Always make time for rest, recovery, and sleep.
- A clear life purpose or long-term goal is among the strongest overlooked anti-aging factors.
- Your perceived social life plays a huge role in longevity. Reconnect with old friends or meet new people.
- Genetics have not changed over the last century, but chronic disease has. Aging is largely epigenetic and preventable.
- Strategically replace what declines with age: enzymes, amino acids, collagen, vitamins, minerals, mitochondrial optimizers, and gut-microbiome diversity.
- Adaptogens help balance the HPA axis and have been used for longevity for thousands of years.
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The deep dives readers use most, organized by where you are.
Fundamentals
Supplements & molecules
Longevity: common questions
What is the difference between healthspan and lifespan?
Lifespan is the total number of years you live. Healthspan is the portion of those years you spend in good health, free from chronic disease and meaningful disability. In the U.S., lifespan runs to roughly 78 years while healthspan ends near 66. That is a gap of about 9 to 12 years, described in a 2021 review in Nature Aging. The goal of longevity work is to shrink that gap.
What actually extends human lifespan?
The interventions with the strongest evidence are the least glamorous. Cardiorespiratory fitness shows an inverse, no-ceiling relationship with death in a 2018 cohort of 122,007 people. Muscle strength predicts survival, with the weakest 20% by grip carrying about 2.2 to 2.5 times the mortality risk. Regular physical activity cuts all-cause mortality 20 to 40%. Sleep, low chronic inflammation, stable blood sugar, and strong social ties round out the list.
Do longevity supplements like NMN and NAD+ boosters work?
They reliably raise blood NAD+ levels. The leap from raising NAD+ to slowing aging is not yet proven. NMN consistently elevates NAD+, but a 2025 meta-analysis of 10 randomized trials found no benefit for muscle mass, strength, or physical function in older adults. Some small trials report modest gains in walking speed and sleep. Treat NAD+ boosters as promising but unproven, not as a foundation.
Is rapamycin or metformin worth taking for longevity?
Both are exciting in animals and unproven for extending healthy human lifespan. The 2025 PEARL trial found low-dose intermittent rapamycin was well tolerated over a year, with modest biomarker changes and no proof it lengthens human life. The large TAME trial for metformin is still running. It is the primary clinical test of metformin for aging in non-diabetics. Neither is a proven longevity drug today, and both require medical supervision.
Can you actually reverse your biological age?
You can measurably slow your pace of aging, and some markers do improve. DNA-methylation clocks like DunedinPACE track aging in real time. In the 2024 DO-HEALTH trial, omega-3 slowed several aging clocks by the equivalent of about 3 to 4 months over 3 years. The effect was larger when combined with vitamin D and strength training. Reversal headlines overpromise. Consistent slowing is the realistic, evidence-backed win.
Are the Blue Zones a reliable longevity blueprint?
Treat them with caution. UCL demographer Saul Newman won a 2024 Ig Nobel Prize for showing that many extreme old-age records correlate with poverty, missing birth certificates, and pension fraud rather than diet. The healthy habits associated with these regions still hold up on their own. The specific century-old claims do not.
Is longevity testing worth the money?
It is worth it if a number will change your behavior. Tracking predictors like VO2 max, grip strength, and standard blood markers gives you a baseline you can move and re-test. Epigenetic clocks are the most marketed option, but they carry measurement noise. Look at the trend over multiple readings rather than reacting to one score. Start with the cheap, validated markers before paying for frontier tests.
How early should you start working on longevity?
The earlier the better, because the inputs compound. Muscle, fitness, and metabolic health built in your 30s and 40s are far easier to maintain than to rebuild at 70. The same markers that predict survival respond to training at any age. You do not need an expensive protocol to start. Walking, lifting, protecting sleep, and getting daily sunlight carry most of the proven benefit.
