Grip strength is cheap, quick, objective, and among the strongest predictors of all-cause mortality — frequently outperforming systolic blood pressure.
Maximal handgrip force is a proxy for total-body strength and neuromuscular integrity, not a statement about your forearms. It is one of very few whole-system measures that needs no laboratory.
It also predicts recovery from surgery, fall and fracture risk, and the ability to live independently.
Figures are kilograms of force, best of three attempts on the dominant hand. Columns are population percentiles — the 97th means better than 97% of people that age and sex.
Every band falls with age, but the spread at any one age is wider than the fall across four decades — which is the useful part. Where you sit relative to your peers is more within your control than the ageing itself.
| Age | 97th | 75th | 50th | 25th |
|---|---|---|---|---|
| 20-29 | 62 | 52 | 47 | 40 |
| 30-39 | 63 | 53 | 48 | 41 |
| 40-49 | 61 | 51 | 46 | 39 |
| 50-59 | 56 | 47 | 42 | 36 |
| 60-69 | 51 | 42 | 37 | 31 |
| 70+ | 44 | 36 | 31 | 26 |
| Age | 97th | 75th | 50th | 25th |
|---|---|---|---|---|
| 20-29 | 40 | 33 | 29 | 24 |
| 30-39 | 41 | 34 | 29 | 24 |
| 40-49 | 39 | 32 | 27 | 22 |
| 50-59 | 36 | 29 | 24 | 20 |
| 60-69 | 32 | 26 | 22 | 17 |
| 70+ | 27 | 21 | 17 | 13 |
These are the exact values the Longevity Score calculator scores against, read from the engine rather than retyped, so the chart and your score cannot disagree.
A value at or above the 97th percentile for your age and sex scores as optimal; 75th to 97th as good; 50th to 75th as borderline. Clinical cut-points identify frailty — the point at which function is already compromised — which is a floor rather than a target. The optimal band sits well above it, because reserve is what buys tolerance to illness, surgery and injury later.
Protocol differences explain most confusing results. Sit with the elbow at 90 degrees and the forearm neutral, squeeze maximally for three seconds, rest a minute, and take the best of three attempts on the dominant hand.
Use the same device each time. Dynamometers vary, and a change of instrument resets your baseline.
A usable hand dynamometer costs around $25. Many gyms and most physiotherapy clinics have one, and some longevity-oriented practices include it in a standard assessment.
If grip strength is unavailable, other inputs can contribute to the structural dial. Do not attempt the floor-based sitting-rising test if it might be unsafe.
Grip reflects total-body strength, so train that rather than the grip itself. Compound pulling movements, loaded carries and progressive resistance work two to three times weekly are what move it.
Neural adaptation shows up within weeks; structural change takes months. This is a marker that rewards consistency more than intensity.
See where you sit across all 8 dialsA value at or above the 97th percentile for your age and sex scores as optimal; 75th to 97th as good; 50th to 75th as borderline. Clinical cut-points identify frailty — the point at which function is already compromised — which is a floor rather than a target. The optimal band sits well above it, because reserve is what buys tolerance to illness, surgery and injury later.
What grip strength measures · The structural dial · Measuring without bloodwork
Choose a question. Answers come from this site, and nothing you open is sent anywhere.
A value at or above the 97th percentile for your age and sex scores as optimal; 75th to 97th as good; 50th to 75th as borderline. Clinical cut-points identify frailty — the point at which function is already compromised — which is a floor rather than a target. The optimal band sits well above it, because reserve is what buys tolerance to illness, surgery and injury later.
Chronological age counts birthdays. Biological age estimates how old your body appears to be functioning, based on measurable biomarkers. Two people born the same year can differ by a decade or more in vascular stiffness, insulin signalling or cardiorespiratory fitness. Biological age makes that gap explicit — and unlike your birthday, it can move in either direction.
Each biomarker you enter is scored against longevity-optimised reference ranges and grouped into one of eight dials. Every dial produces its own biological age, and those are combined using fixed weights into a single composite, then expressed as a Longevity Score from 0 to 100. The weighting reflects how strongly each system predicts healthspan: structural and vascular carry the most, hormonal the least.
No. The short form contains a subset of scoring inputs plus context-only fields, and you can leave any of them blank. It is not a recommendation to obtain tests. Missing values are excluded from the calculation — never treated as zero or as 'normal'. A dial with no scored data is dropped entirely and the remaining weights renormalise.
Some inputs can be measured without bloodwork. Blood pressure needs a home cuff and waist-to-height needs a tape measure. Wearable estimates vary; the floor-based sitting-rising test carries a fall risk and should only be attempted if safe.
Both terms describe what this tool does, and which one fits depends on what you are asking. "Anti-aging" is the term most people search, and loosely means anything aimed at slowing or reversing age-related decline — this tool fits that description if you score your dials and act on what you find. "Healthspan calculator" is the more precise term: healthspan is the number of years lived without serious chronic disease or disability, and that cannot be measured directly, so this tool scores eight systems that each function as an early-warning proxy for it. Either way, the method is the same: real biomarkers, published thresholds, no vanity-metric framing.
Several popular tools ask only about habits — exercise days, sleep hours, smoking, diet quality — and return a single precise-looking age. We looked at the research behind that approach and chose not to build it. Published studies do show real, individually-measured links between specific habits and epigenetic age acceleration, but those effect sizes come from different study populations, different DNA-methylation clocks and different measurement units. Adding them together into one number is not something the underlying research actually supports — it produces a precise-looking result built on an imprecise method. Our dials use direct physiological measurements instead: a real blood pressure reading, a real VO₂ max, a real ApoB value. Several dials score from home-measurable data alone with no quiz-guessing involved — see what you can measure without a blood test, above.
Standard reference ranges describe what is common in a general population, which now includes a great deal of metabolic dysfunction. They are tuned to flag disease, not to identify what is optimal for a long healthspan. A fasting insulin of 20 µIU/mL sits inside most labs' normal range and is strongly associated with insulin resistance. This tool uses longevity-optimised thresholds instead, so a flag here means room for optimisation — not a diagnosis.
For understanding a single result, do — a frontier chat model is genuinely good at that, often clearer than most medical sites, and it handles markers no fixed tool covers. The limitation is different from the one most people assume. A language model produces a plausible response rather than a computed one, so the same panel can score differently on different days. That is fine when exploring an idea and disqualifying when measuring change, because you cannot tell how much of a difference is you and how much is the method. Use both: a chat model to understand, a fixed instrument to track.
Biomarker values, assessment history and visit-preparation drafts are stored in your browser. The visit draft is separate from assessment exports and share links; copying or printing it can leave a copy outside the browser. There are no user accounts or third-party tracking. We keep anonymous usage totals on our own server, such as how many people reached a results screen on a given day; browsers sending Do Not Track or Global Privacy Control are not counted. Optional lab-report upload and AI coach features send data to Anthropic. Optional retest reminders send an email address, date and reminder label to our service and email provider. See our privacy policy for details.