📊 Understanding Your Longevity Score
Your longevity score represents an estimated lifespan based on peer-reviewed research from Harvard T.H. Chan School of Public Health, the National Institute on Aging, and WHO databases. This guide helps you interpret your results and understand which factors have the greatest impact on your health span.
How to read it: the number starts from the average for your age and sex in the Irish life table (CSO 2015–2017) and moves up or down with your answers. However healthy your answers, at age 50 it stays within about 8.6 years (women) or 6.2 years (men) above that average, which is where Li et al. (2018, Circulation) put people with all five low-risk habits. The limit is smaller at older ages.
🎯 Factor Impact Ranking
Not all factors count equally. The middle column shows how far each group of answers can move the estimate at age 50 in this calculator, before the overall limit above and the smaller effects at older ages.
| Rank | Factor Category | Range in this calculator (age 50) | Scientific Basis |
|---|---|---|---|
| 1 | Exercise Frequency & Type | −2 to about +4.4 years (steps, cardio, strength, sauna) | Large cohort studies: regular activity goes with clearly lower mortality |
| 2 | Sleep Quality & Duration | −2.5 to about +0.7 years | IEEE Pulse 2019: Sleep quality directly correlates with mortality |
| 3 | Nutrition Pattern | about −1.4 to +1.5 years | PREDIMED trial: a Mediterranean diet cut major cardiovascular events by about 30% |
| 4 | Chronic Health Status | 0 or lower: conditions only lower the estimate | CDC data: Managing conditions critical for lifespan |
| 5 | Stress Management | −3 to about +0.7 years | Psychosomatic Medicine 2009: Chronic stress reduces lifespan |
| 6 | Social Connections | −1 to about +0.9 years | Brigham Young University meta-analysis: Strong social ties add years |
| 7 | Education Level | −0.3 to +0.9 years | Balaj 2024 (Lancet Public Health): about 2% lower mortality per year of schooling; shares a budget with income (Stringhini 2017, Lancet) |
| 8 | Parents’ Age at Death | −0.9 to +1.2 years | Atkins 2016 (JACC, UK Biobank): about 17% lower mortality per decade a parent lived past 70; counted at half |
| 9 | Income & Marital Status | income −0.6 to +0.6; married +0.7, single −0.8 | Stringhini 2017 (Lancet); Wang 2020 (Global Health Research and Policy) |
| – | Health Check-ups | no effect | Cochrane review, 11 trials (Krogsbøll 2019): general health checks did not reduce deaths |
✅ Actionable Improvement Steps
A suggested order for changes, starting with the ones that move the estimate most in this calculator. It is a plan, not a promise: the estimate is educational and has an upper limit.
Phase 1: High-Impact Changes (Start Here)
- Priority 1A: Add 150 minutes of moderate cardio weekly (30 min × 5 days)
- Priority 1B: Optimize sleep: Aim for 7-9 hours nightly with consistent schedule
- Priority 1C: Reduce stress: try 10 minutes a day of quiet breathing, a walk or meditation (lower stress counts in this calculator; meditation itself only a little)
Phase 2: Medium-Impact Changes (2-3 Months In)
- Priority 2A: Add strength training 2-3 times per week
- Priority 2B: Shift to Mediterranean diet (increase vegetables, reduce red meat)
- Priority 2C: Increase social connection: Weekly meetups or activities
Phase 3: Maintenance & Advanced (3+ Months In)
- Priority 3A: Add high-intensity interval training 1-2x weekly
- Priority 3B: Manage any long-term conditions with your clinician (routine check-ups on their own do not change the estimate: a Cochrane review found general health checks did not reduce deaths)
- Priority 3C: Advanced nutrition: Optimize micronutrients, add fish 2x weekly
📈 Tracking Your Progress
Retest yourself every 3 months to see measurable improvements. Most people see changes in their score within 6-12 weeks of consistent lifestyle modifications.
Progress Milestone Tracker
🔗 Learn More
Dive deeper into specific areas:
How Our Methodology WorksExercise Science & ResearchNutrition & Diet StudiesSleep Optimization Guide