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Welcuren Longevity Lab

Discover your biological age. Understand your health. Improve your future.

Science-informed longevity assessments, plain-English explanations of key health and fitness measures, and progress tracking with personal insights.

Start my longevity assessmentCalculate my biological ageExplore all toolsView my dashboard

Featured assessments

01 · 2–5 minBiological Age CalculatorTwo pathways: a lifestyle ageing profile, or a validated blood-based PhenoAge if you have recent results.Open →02 · 30 secLife Expectancy CalculatorAverage years ahead and the population chance of reaching 80, 90 and 100 for your age and sex in the UK.Open →04 · 4 minLongevity Lifestyle Assessment27 questions on movement, sleep, food, stress, purpose and connection. See your nine-area profile and top 3 changes.Open →09 · 1 minVO₂ Max & Fitness AgeEstimate VO₂ max from your heart rate and compare with population medians to find your fitness age.Open →10 · 1 minGrip Strength AgeCompare your hand-grip strength with UK reference values and find your grip age.Open →15 · 1 minReaction Time TestA 10-round in-browser test of simple reaction speed and consistency.Open →17 · 2 minSleep Quality AssessmentDuration, regularity, sleep onset and daytime alertness in a 2-minute check.Open →

Browse by category

Biological Age & Lifespan

How you're ageing, how long people like you live on average, and what shapes it.

4 tools

Heart & Metabolic Health

Heart age, cardiovascular risk, insulin resistance and metabolic health.

0 tools

Fitness & Physical Ageing

Fitness, strength, balance and walking speed — some of the strongest signals of healthy ageing.

6 tools

Brain & Cognitive Health

Quick in-browser tests of reaction time and working memory.

2 tools

Sleep, Recovery & Lifestyle

Sleep, heart-rate variability, stress and nutrition quality.

4 tools

Bloodwork & Health Tracking

Understand blood results you already have, and track your progress over time.

2 tools

All tools

Biological Age & Lifespan

01 · 2–5 minBiological Age CalculatorTwo pathways: a lifestyle ageing profile, or a validated blood-based PhenoAge if you have recent results.Open →02 · 30 secLife Expectancy CalculatorAverage years ahead and the population chance of reaching 80, 90 and 100 for your age and sex in the UK.Open →04 · 4 minLongevity Lifestyle Assessment27 questions on movement, sleep, food, stress, purpose and connection. See your nine-area profile and top 3 changes.Open →08 · 1 minBody Composition & Waist RiskBMI, waist-to-height, waist-to-hip and estimated body fat, explained.Open →

Fitness & Physical Ageing

09 · 1 minVO₂ Max & Fitness AgeEstimate VO₂ max from your heart rate and compare with population medians to find your fitness age.Open →10 · 1 minGrip Strength AgeCompare your hand-grip strength with UK reference values and find your grip age.Open →11 · 2 minSit-to-Rise TestSit on the floor and stand up — scored out of 10 for strength, flexibility and balance.Open →12 · 1 minWalking Speed CalculatorTime a short walk at your usual pace — gait speed is a powerful signal of healthy ageing.Open →13 · 2 minStrength & Muscle RetentionThe SARC-F questionnaire plus a 5-times chair-stand test.Open →14 · 30 secZone 2 Heart RateYour personal Zone 2 training range from age and resting heart rate.Open →

Brain & Cognitive Health

15 · 1 minReaction Time TestA 10-round in-browser test of simple reaction speed and consistency.Open →16 · 3 minCognitive Performance ChallengeDigit-span memory challenge — how many digits can you hold in mind?Open →

Sleep, Recovery & Lifestyle

17 · 2 minSleep Quality AssessmentDuration, regularity, sleep onset and daytime alertness in a 2-minute check.Open →18 · 30 secHRV & Recovery BenchmarkCompare today's heart-rate variability with your own baseline to judge recovery.Open →19 · 2 minStress & Resilience AssessmentHow stretched you feel, and the habits that help you bounce back.Open →20 · 2 minNutrition Quality AssessmentThe 14-point Mediterranean diet score used in the PREDIMED trial.Open →

Bloodwork & Health Tracking

24Healthspan Progress TrackerAll your saved results in one place, with trends and a printable snapshot.Open →25My Longevity DashboardYour personal dashboard: latest results, trends, export, sharing and data controls.Open →

Understanding biological age

Biological age estimates how your body is functioning compared with others your age. Only validated models — like PhenoAge from blood markers — produce an age number here. Lifestyle and fitness tools show where you stand against published reference values.

Evidence and methodology

Every tool lists its source, intended population and limitations. Risk and blood calculators are listed only after clinical review.

How our tools work →

Quick calculators

Sleep debt this week

5h below an 8-hour night this week.

That's a lot to carry. A steady bedtime matters more than catch-up lie-ins.

Read about sleep →

Daily protein target

84–112g protein a day

Spread across meals. If you have a kidney condition, check with your GP first.

Read about metabolism →

Caffeine cut-off

Last coffee by 15:00

Caffeine lingers for hours, so stopping about 8 hours before bed protects deep sleep.

Read about caffeine and sleep →

Lifestyle check

50/100 everyday habits score

A general wellness snapshot, not a medical measure. Take the full profile for personal reading.

Read about ageing well →