← Longevity Lab
Evidence and methodology
Every tool uses a published method or an honest, clearly labelled educational questionnaire. We don't invent biological-age scores. Risk and blood calculators are only listed publicly after review by our clinical team.
Educational tool
General wellness guidance using published reference values or our own questionnaire.
Awaiting clinical review
Uses a published clinical model; available only as a preview until signed off.
Clinically reviewed
Checked and approved by a Welcuren clinician.
Biological Age & Lifespan
| Tool | Model and source | Population | Status |
|---|---|---|---|
| Biological Age Calculator | Biological age pathways (v1.0). Basic: Welcuren Lifestyle Assessment. Advanced: Levine ME et al. An epigenetic biomarker of aging… (PhenoAge), Aging 2018. Reference | Adults 18+ | Educational tool |
| Life Expectancy Calculator | UK period life expectancy (smoothed) (v1.0). Gompertz–Makeham curve fitted to ONS National life tables, UK 2018–2020 (life expectancy at birth and at 65). Reference | UK residents | Educational tool |
| Longevity Lifestyle Assessment | Welcuren Lifestyle Assessment (v2.0). Original Welcuren questionnaire grounded in established longevity risk factors (smoking, activity, diet, alcohol, sleep, social connection) — e.g. Li Y et al., Circulation 2018. Reference | Adults 18+ | Educational tool |
| Body Composition & Waist Risk | BMI, WHtR, WHR, Deurenberg body fat (v1.0). NICE NG246 (2025) waist-to-height; WHO 2008 waist-hip; Deurenberg P et al., Br J Nutr 1991. Reference | Adults 18+, not pregnant | Educational tool |
Heart & Metabolic Health
| Tool | Model and source | Population | Status |
|---|---|---|---|
| Heart Age Calculator | Framingham general CVD heart age (v2008). D'Agostino RB et al. General cardiovascular risk profile for use in primary care. Circulation 2008;117:743–753. Reference | Adults 30–74 without known cardiovascular disease | Awaiting clinical review |
| Metabolic Health Assessment | IDF metabolic syndrome criteria (v2006). International Diabetes Federation. The IDF consensus worldwide definition of the metabolic syndrome, 2006. Reference | Adults | Awaiting clinical review |
| Cardiovascular Risk Explorer | Framingham 2008 lipid model — factor breakdown (v2008). D'Agostino RB et al., Circulation 2008. Reference | Adults 30–74 without cardiovascular disease | Awaiting clinical review |
| Insulin Resistance Calculator | HOMA-IR and TyG index (v1.0). Matthews DR et al., Diabetologia 1985 (HOMA); Simental-Mendía LE et al., Metab Syndr Relat Disord 2008 (TyG). Reference | Adults not on insulin | Awaiting clinical review |
Fitness & Physical Ageing
| Tool | Model and source | Population | Status |
|---|---|---|---|
| VO₂ Max & Fitness Age | Uth heart-rate ratio + FRIEND medians (v1.0). Uth N et al., Eur J Appl Physiol 2004; Kaminsky LA et al., Mayo Clin Proc 2015 (FRIEND registry). Reference | Healthy adults 20–85 | Educational tool |
| Grip Strength Age | UK grip strength reference values (v1.0). Dodds RM et al. Grip strength across the life course: normative data from twelve British studies. PLoS One 2014. Low-strength cut-off: EWGSOP2, Age Ageing 2019. Reference | Adults 20–95 | Educational tool |
| Sit-to-Rise Test | Sitting-rising test (v1.0). Brito LBB, Araújo CGS et al. Ability to sit and rise from the floor as a predictor of all-cause mortality. Eur J Prev Cardiol 2012. Reference | Adults 51–80 in the original study | Educational tool |
| Walking Speed Calculator | Gait speed bands (v1.0). Studenski S et al. Gait speed and survival in older adults. JAMA 2011;305:50–58. Reference | Adults 65+ in original data | Educational tool |
| Strength & Muscle Retention | SARC-F + chair stand (v1.0). Malmstrom TK, Morley JE. J Am Med Dir Assoc 2013; Cruz-Jentoft AJ et al. (EWGSOP2), Age Ageing 2019. Reference | Adults, mainly 60+ | Educational tool |
| Zone 2 Heart Rate | Tanaka max HR + Karvonen reserve (v1.0). Tanaka H et al., J Am Coll Cardiol 2001; Karvonen MJ et al., Ann Med Exp Biol Fenn 1957. Reference | Healthy adults | Educational tool |
Brain & Cognitive Health
| Tool | Model and source | Population | Status |
|---|---|---|---|
| Reaction Time Test | Simple reaction time (v1.0). Method after Der G, Deary IJ. Age and sex differences in reaction time in adulthood (UK Health and Lifestyle Survey). Psychol Aging 2006. Reference | Adults | Educational tool |
| Cognitive Performance Challenge | Forward digit span (v1.0). Digit span is a long-standing working-memory measure; typical adult forward span is about 7 ± 2 (Miller GA, Psychol Rev 1956). Reference | Adults | Educational tool |
Sleep, Recovery & Lifestyle
| Tool | Model and source | Population | Status |
|---|---|---|---|
| Sleep Quality Assessment | Welcuren sleep check (v1.0). Original Welcuren questionnaire; duration targets from Hirshkowitz M et al., National Sleep Foundation recommendations, Sleep Health 2015. Reference | Adults | Educational tool |
| HRV & Recovery Benchmark | HRV deviation from personal baseline (v1.0). Plews DJ et al., Int J Sports Physiol Perform 2013 (baseline-relative HRV); Nunan D et al., Pacing Clin Electrophysiol 2010 (normative ranges). Reference | Healthy adults using a wearable | Educational tool |
| Stress & Resilience Assessment | Welcuren stress & resilience check (v1.0). Original Welcuren questionnaire informed by perceived-stress and resilience research (Cohen S et al., 1983; Smith BW et al., 2008). Reference | Adults | Educational tool |
| Nutrition Quality Assessment | MEDAS-14 Mediterranean diet adherence (v1.0). Schröder H et al. A short screener is valid for assessing Mediterranean diet adherence. J Nutr 2011 (PREDIMED). Reference | Adults | Educational tool |
Bloodwork & Health Tracking
| Tool | Model and source | Population | Status |
|---|---|---|---|
| PhenoAge Blood Calculator | Levine PhenoAge (v2018). Levine ME et al. An epigenetic biomarker of aging for lifespan and healthspan. Aging (Albany NY) 2018;10:573–591. Reference | Adults 20+ (derived in US NHANES) | Awaiting clinical review |
| Cholesterol & Lipid Explorer | NHS / HEART UK lipid reference values (v1.0). NHS — High cholesterol; HEART UK — Understanding your cholesterol results. Reference | Adults | Awaiting clinical review |
| Kidney Function Calculator | CKD-EPI 2021 creatinine equation (v2021). Inker LA et al. New creatinine- and cystatin C–based equations to estimate GFR without race. N Engl J Med 2021;385:1737–1749. Reference | Adults 18+ | Awaiting clinical review |
| Healthspan Progress Tracker | Saved results tracker (v1.0). Welcuren — aggregates your saved results. | All | Educational tool |
| My Longevity Dashboard | Member dashboard (v1.0). Welcuren. | Signed-in members | Educational tool |
Privacy
Nothing you type into a tool is stored unless you choose to save it and give consent. Saved results are visible only to you, kept for up to 24 months, and can be downloaded or deleted from your dashboard. We never share them with advertisers.