# Biological Age Test

Pace of aging is how fast your body ages relative to calendar time. A pace of 1.0 means you age 1 biological year per chronological year; below 1.0 means you are aging slower than average, and above 1.0 faster. This free test estimates your pace of aging from 8 evidence-based lifestyle factors in about 2 minutes, no signup required.

## Key figures

- Your pace of aging compares your biological aging speed to 1 year per calendar year (1.0 = average).
- Roughly 70 to 80 percent of your pace of aging is driven by modifiable lifestyle; about 20 to 30 percent by genetics.
- Biological age is how old your body seems; chronological age is how many years you have lived.
- This is a lifestyle estimate, not a laboratory DunedinPACE test, which requires a blood DNA-methylation sample.

## Biological age vs chronological age vs pace of aging

- Chronological age: How many years you have lived (41 years)
- Biological age: How old your body seems to be (39 years)
- Pace of aging: How fast you are aging right now (0.94 (6% slower))

## How We Calculate This

This is not a simple questionnaire. The Pace of Aging Test uses a multi-factor mathematical model with exponential compression, gender-specific scoring, and age-dependent adjustments, calibrated against 32 peer-reviewed studies. Every number below is derived from published epigenetic aging research.

- Pace = 1.0 + f( Σδᵢ / 22 )
- If offset > 0:  f(x) = 0.30 × (1 − e^(−x / 0.30))
- Asymptote at +0.30 → pace approaches 1.30
- If offset ≤ 0:  f(x) = −0.25 × (1 − e^(x / 0.25))
- Asymptote at −0.25 → pace approaches 0.75
- Linear zone: up to +5.0 / −3.0 years passed through unchanged
- Dampened zone: excess beyond thresholds reduced at 50% rate
- Hard cap: final offset clamped to +8.0 / −4.5 years
- Biological Age = Chronological Age + compressed delta

## Scientific References & Methodology

This assessment is based on peer-reviewed research examining the relationship between lifestyle factors and biological aging markers. Below are the studies that informed the calculations and their influence on the results.

Important methodology note: This questionnaire is observational and correlational, and reflects population-level associations from research studies. It does not account for individual variation or genetic factors. Some people may respond differently to these lifestyle factors based on their genetics, medical history, or other circumstances. The results provide a directional estimate based on average population responses, not personalized predictions.

Disclaimer: This self-assessment is based on associations observed in peer-reviewed research on lifestyle and aging biology (e.g., sleep duration, physical activity, diet patterns, smoking status, alcohol intake, and BMI). It provides a directional estimate only and is not a substitute for professional medical advice, diagnosis, or treatment. If you have health concerns, please consult a qualified healthcare professional.

## Smoking: what the studies show

Influence on results: Smoking significantly accelerates biological aging. Current smokers show +3.5 years age acceleration. Former smokers show moderate acceleration (+2.0 years). Never-smokers have neutral effect (0 years). Results are compressed to prevent unrealistic extremes. Note: McCartney et al. (2018) found that smoking-related methylation changes are partially reversible after cessation, suggesting the +2.0y for former smokers is a conservative fixed estimate. Actual acceleration likely decreases over time since quitting. Lei et al. (2017) is a pilot study (n=22), and its effect sizes should be interpreted cautiously.

## Sleep: what the studies show

Influence on results: Sleep duration has a U-shaped relationship with biological aging. Less than 6 hours per night adds +0.7 years, 6-7 hours adds +0.2 years, while 7-9 hours shows a protective effect (-0.7 years). Oversleeping 9-10 hours adds +0.3 years, and over 10 hours adds +0.8 years. These values are calibrated to observational estimates from Wu et al. 2025 (UK Biobank, n=442,664) and You et al. 2024 (NHANES). Results are compressed to prevent unrealistic extremes.

Note: The Wu et al. 2025 Mendelian randomization analysis found stronger causal evidence for short sleep than long sleep. The observational U-shape on the long-sleep side may partly reflect reverse causation (underlying illness causing both excessive sleep and accelerated aging). We apply a moderate penalty for oversleeping (+0.3 to +0.8 years) as a precautionary approach, acknowledging this limitation.

## Exercise: what the studies show

Influence on results: Regular physical activity slows biological aging with a dose-response curve. No exercise adds +1.5 years, 1 day/week adds +1.0 year, 2-3 days/week (WHO minimum) has neutral effect (0 years), 4-5 days/week provides strong protection (-1.5 years), and 6-7 days/week provides optimal protection (-1.5 years). Results are compressed to prevent unrealistic extremes.

## Alcohol: what the studies show

Influence on results: Alcohol consumption affects biological aging with 4 tiers and gender-differentiated scoring. Never drinking: -0.3 years. Light: 0 years. Moderate: +0.2 years (men) / +0.3 years (women). Heavy: +1.2 years (men) / +2.0 years (women). Alcohol penalties are age-gated: reduced by 60% for users under 35 and by 30% for users 35-44, reflecting weaker evidence in younger populations. Results are compressed to prevent unrealistic extremes.

## Diet: what the studies show

Influence on results: Diet quality impacts biological aging. Poor diet (ultra-processed foods) adds +1.0 year (Cardoso et al., 2024: highest UPF quintile = +0.86y PhenoAge), average diet adds +0.5 years, good diet shows protective effect (-0.5 years), and excellent diet (predominantly whole foods, Mediterranean-style) provides protection of -1.0 year. This is based on the Kresovich et al. 2022 Sister Study (n=2,694): Alternative Healthy Eating Index showed PhenoAgeAccel beta = -0.5y and GrimAgeAccel beta = -0.4y per 1-SD increase in diet quality. Note: the NU-AGE Mediterranean RCT (-1.47y) was a subgroup finding (Polish females, n=36; overall trend not significant). The PMC8064200 multi-component RCT showed -1.96y within-group (p=0.066, not significant) but combined diet, exercise, sleep, relaxation, and supplementation, so effects cannot be attributed to diet alone.

## Stress: what the studies show

Influence on results: Chronic stress is associated with biological aging, though direct epigenetic evidence is weaker than for other factors. High stress adds +0.5 years. Moderate stress has neutral effect (0 years). Low stress provides mild protection (-0.2 years). Results are compressed to prevent unrealistic extremes.

## Social connections: what the studies show

Influence on results: Social isolation is a risk factor for biological aging. Very isolated individuals add +0.8 years, somewhat isolated adds +0.4 years, moderately active has neutral effect (0 years), socially active shows protective effects (-0.3 years), and very socially active provides protection (-0.7 years).

## BMI: what the studies show

Influence on results: BMI shows a U-shaped relationship with biological aging, with gender-differentiated scoring. The band edges are the WHO cut-points and are the same for both sexes; only the size of the delta differs. For women: underweight (BMI <18.5) adds +0.8 years, normal weight (18.5-25) is protective (-0.5 years), overweight (25-30) adds +0.5 years, and obesity (BMI >30) adds +2.0 years. For men: underweight adds +0.5 years, normal weight (18.5-25) is protective (-0.5 years), overweight (25-30) adds +0.4 years (Wen et al., 2025: only 1/13 clocks nominally accelerated for consistent overweight), and obesity adds +1.8 years (de Toro-Martin et al., 2019: +2.3y per 10 BMI units in visceral adipose).


## FAQ

### How fast am I aging?

Your pace of aging compares how quickly your body ages against 1 year per calendar year. A pace of 1.0 is average; below 1.0 means slower biological aging, and above 1.0 faster. This free test estimates your pace from 8 lifestyle factors: sleep, exercise, diet, smoking, alcohol, stress, body composition and social connection.

### Can you calculate, measure or determine your biological age?

You can calculate it here, as a pace rather than a number of years: this test calculates how fast you are aging biologically in about 2 minutes from 8 lifestyle factors, expressed as biological years per calendar year. Measuring or determining biological age in the strict sense needs a laboratory, usually an epigenetic DNA-methylation test such as DunedinPACE, PhenoAge or GrimAge. Both answer the same question from different angles: the lifestyle calculation shows you immediately which habits drive your pace of aging, the lab test returns a measured value from a blood sample.

### What is pace of aging, and what is DunedinPACE?

Pace of aging is the speed at which your body deteriorates over time, expressed as biological years per calendar year. DunedinPACE is a blood-based epigenetic measure developed from the Dunedin Study (Belsky et al., 2022) that quantifies this rate from DNA methylation. This test uses the same pace-of-aging concept but estimates it from lifestyle inputs rather than a blood sample.

### How is biological age different from chronological age?

Chronological age is simply how many years you have been alive. Biological age reflects how old your body actually seems based on your health and lifestyle, and can be higher or lower than your chronological age. 2 people aged 50 can have biological ages of 45 and 58.

### Can you reverse your biological age?

You cannot reverse chronological age, but studies show biological aging can be slowed and partly reversed by improving modifiable factors: sleeping 7 to 9 hours, exercising several times a week, eating a whole-food diet, not smoking, moderating alcohol, managing stress and staying socially connected.

### How accurate is this biological age test?

It is an educational estimate grounded in published lifestyle geroscience studies, not a medical diagnosis. For clinically validated figures, use laboratory epigenetic clocks such as Horvath, GrimAge or DunedinPACE. This test is best used to see which habits most affect your aging and to track changes over time.

### Which factors speed up aging the most?

In this model, current smoking raises your pace of aging the most, followed by obesity, physical inactivity, heavy alcohol use and chronic short sleep. Improving these has the largest effect on slowing your estimated pace of aging.

## Sources

- Lei et al., 2017 - "A Pilot Investigation of the Impact of Smoking Cessation on Biological Age". The American Journal on Addictions. https://doi.org/10.1111/ajad.12502
- McCartney et al., 2018 - "Epigenetic signatures of starting and stopping smoking". EBioMedicine. https://doi.org/10.1016/j.ebiom.2018.10.051
- Zhang et al., 2025 - "Lifestyles and their relative contribution to biological aging across multiple-organ systems: change analysis from the China Multi-Ethnic Cohort study". eLife. https://doi.org/10.7554/eLife.99924
- Pośpiech et al., 2024 - "DNA methylation at AHRR as a master predictor of smoke exposure and a biomarker for sleep and exercise". Clinical Epigenetics. https://doi.org/10.1186/s13148-024-01757-0
- Wu et al., 2025 - "Evaluating the nonlinear effects of sleep duration on biological aging across phenotypic, genomic, and epigenomic data". Aging. https://doi.org/10.18632/aging.206306
- Kusters et al., 2024 - "Short Sleep and Insomnia Are Associated With Accelerated Epigenetic Age". Psychosomatic Medicine. https://doi.org/10.1097/PSY.0000000000001243
- Miao et al., 2025 - "Poor sleep health is associated with older brain age: the role of systemic inflammation". eBioMedicine. https://doi.org/10.1016/j.ebiom.2025.105941
- Fox et al., 2023 - "Physical activity is associated with slower epigenetic aging". Aging Cell. https://doi.org/10.1111/acel.13828
- Silva Rodrigues et al., 2023 - "Eight Weeks of Physical Training Decreases 2 Years of DNA Methylation Age". Research Quarterly for Exercise and Sport. https://doi.org/10.1080/02701367.2023.2228388
- Kawamura et al., 2025 - "Exercise as a geroprotector: focusing on epigenetic aging". Aging. https://doi.org/10.18632/aging.206278
- Pyrkov & Fedichev, 2019 - "Biological age is a universal marker of aging, stress, and frailty". Book chapter in: Biomarkers of Human Aging (Springer). https://doi.org/10.1007/978-3-030-24970-0_3
- Wang et al., 2023 - "Alcohol consumption and epigenetic age acceleration across human adulthood". Aging. https://doi.org/10.18632/aging.205153
- Liang, Xu et al., 2022 - "A new monocyte epigenetic clock reveals nonlinear effects of alcohol consumption on biological aging in three independent cohorts (N=2,242)". Alcoholism: Clinical and Experimental Research. https://doi.org/10.1111/acer.14803
- Zhang et al., 2025 - "Lifestyles and their relative contribution to biological aging across multiple-organ systems: change analysis from the China Multi-Ethnic Cohort study". eLife. https://doi.org/10.7554/eLife.99924
- Ravi et al., 2025 - "Suboptimal dietary patterns are associated with accelerated biological aging in young adulthood: A study with twins". Clinical Nutrition. https://doi.org/10.1016/j.clnu.2024.12.018
- Villanueva et al., 2025 - "Dietary associations with reduced epigenetic age: a secondary data analysis". Aging. https://doi.org/10.18632/aging.206240
- Stamatakis & Koemel et al., 2025 - "Minimum and optimal combined variations in sleep, physical activity, and nutrition in relation to all-cause mortality risk". BMC Medicine. https://doi.org/10.1186/s12916-024-03833-x
- Cardoso et al., 2024 - "Association between ultra-processed food intake and biological ageing". Age and Ageing. https://doi.org/10.1093/ageing/afae268
- Kresovich et al., 2022 - "Healthy eating patterns and epigenetic measures of biological age" (Sister Study, n=2,694). The American Journal of Clinical Nutrition. https://doi.org/10.1093/ajcn/nqab307
- Mulligan, 2025 - "Epigenetic age acceleration and psychosocial stressors in early childhood". Epigenomics. https://doi.org/10.1080/17501911.2025.2508684
- Zannas et al., 2015 - "Lifetime stress accelerates epigenetic aging in an urban, African American cohort". Genome Biology. https://doi.org/10.1186/s13059-015-0828-5
- Poganik et al., 2023 - "Biological age is increased by stress and restored upon recovery". Cell Metabolism. https://doi.org/10.1016/j.cmet.2023.03.015
- Gao et al., 2023 - "Accelerated biological aging and risk of depression and anxiety". Nature Communications. https://doi.org/10.1038/s41467-023-38013-7
- Holt-Lunstad et al., 2015 - "Loneliness and Social Isolation as Risk Factors for Mortality: A Meta-Analytic Review". Perspectives on Psychological Science. https://doi.org/10.1177/1745691614568352
- Piolatto et al., 2022 - "The effect of social relationships on cognitive decline in older adults". BMC Public Health. https://doi.org/10.1186/s12889-022-12567-5
- Yang et al., 2016 - "Social relationships and physiological determinants of longevity across the human life span". PNAS (Vol. 113, No. 3). https://doi.org/10.1073/pnas.1511085112
- Correa-Burrows et al., 2025 - "Long-Term Obesity and Biological Aging in Young Adults". JAMA Network Open. https://doi.org/10.1001/jamanetworkopen.2025.20011
- Lundgren et al., 2022 - "BMI is positively associated with accelerated epigenetic aging in twin pairs discordant for body mass index". Journal of Internal Medicine. https://doi.org/10.1111/joim.13528
- Etzel et al., 2022 - "Obesity and accelerated epigenetic aging in a high-risk cohort of children". Scientific Reports. https://doi.org/10.1038/s41598-022-11562-5
- Foster et al., 2023 - "Epigenetic age acceleration correlates with BMI in young adults". Aging. https://doi.org/10.18632/aging.204492
- Wen et al., 2025 - "Long-term BMI trajectories and epigenetic age acceleration: the role of genetic risk for obesity". BMC Medicine. https://doi.org/10.1186/s12916-025-04410-6
- de Toro-Martín et al., 2019 - "Body mass index is associated with epigenetic age acceleration in the visceral adipose tissue". Clinical Epigenetics. https://doi.org/10.1186/s13148-019-0754-6

_Full tool: https://longevity-china.com/en/age-test_

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_Canonical: https://longevity-china.com/en/age-test · Part of Longevity Cities · Updated 2026-07-02_