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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Some lifestyle interventions have shifted particular biological-age markers in human studies, but current evidence does not show that lifestyle changes reliably reverse whole-body aging, make someone literally younger, or extend life. Results vary by intervention and measurement, and a lower reading on an aging clock is not proof of better health or longer lifespan.
What does “biological age” measure?
Biological age is not a single quantity that can be directly observed. The studies discussed here use DNA-methylation clocks: algorithms that estimate age-like values or the pace of biological change from patterns in DNA methylation. Different clocks can give different results, and they are not interchangeable. For example, Horvath estimates an age-like value, while DunedinPACE estimates the pace of biological change. The distinction matters when interpreting clock results.
A report that an intervention “reversed biological age” is incomplete unless it identifies the clock, sample type, participants, study length, comparison group, and whether the number reflects change within the intervention group or a difference against controls. These measures are surrogate outcomes: a shift alone does not establish reduced disease, longer life, or reversal of every aging process.
What have lifestyle studies found?
A small, bundled program showed a clock difference, not proof of rejuvenation
In a 2021 randomized pilot trial, Fitzgerald and colleagues studied 43 healthy men aged 50–72 for eight weeks. The program combined dietary guidance, sleep, exercise, relaxation guidance, and probiotic and phytonutrient supplements. Saliva was analyzed using the Horvath DNA-methylation clock. The intervention group’s DNAmAge was 3.23 years lower than the control group’s result (p=0.018). The intervention group’s own average decrease was 1.96 years (p=0.066), which did not meet the conventional threshold for statistical significance. Fitzgerald et al., Aging, 2021.
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Because the program combined several elements, the trial cannot show which component, if any, produced the between-group difference. Its small size, short duration, and all-male, healthy 50–72-year-old sample also limit what can be inferred for other people. The authors called for larger, longer trials and research in other populations.
Physical activity is associated with lower readings on some clocks
A 2026 systematic review included 44 studies and 145,465 participants. In a pooled meta-analysis of seven cross-sectional studies, each standard-deviation increase in physical activity was associated with 0.03 SD lower Horvath age acceleration and 0.09 SD lower GrimAge acceleration. Pooled results for Hannum and PhenoAge were not statistically significant. Many individual associations in the review were not statistically significant, and the meta-analysis was based on cross-sectional evidence, which cannot establish that activity caused the clock differences. Shan et al., The Lancet Healthy Longevity, 2026.
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A three-year trial found small, clock-specific omega-3 effects in older adults
A 2025 analysis of 777 DO-HEALTH trial participants with methylation data at baseline and year three examined daily omega-3, vitamin D, and a home exercise program in a factorial trial. Omega-3 was associated with lower age-acceleration or pace-of-aging values on three of four primary measures: PhenoAge, GrimAge2, and DunedinPACE. The first-generation clocks showed no intervention effect. Vitamin D and the exercise program did not show individual clock effects. The reported standardized effects were small; the paper estimated that the second-generation clock changes corresponded to about 2.9–3.8 months. Participants were generally healthy and active adults aged 70 and older, so this result does not automatically apply to younger or less healthy people. Maier et al., Nature Aging, 2025. It is not a basis for taking supplements solely to try to reverse biological age.
An exploratory yogurt trial did not leave a significant clock result after correction
A 2026 randomized trial tested 12 weeks of exercise and dietary guidance plus daily yogurt containing Bifidobacterium longum BB536 in overweight men aged 50 and older. The authors reported an estimated 2.2% slowing in DunedinPACE in the intervention group. However, after correction for multiple comparisons, no biological-age clock remained statistically significant. The result is preliminary and does not establish that probiotic yogurt reverses age. Nishimura et al., Aging, 2026.
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BMI associations do not make clock findings a complete account of health
A 2019 review of 61 studies found pooled associations between BMI and higher age estimates on the Hannum clock (coefficient 0.07; 95% CI 0.04 to 0.10) and Horvath clock (0.06; 95% CI 0.02 to 0.10). It found no statistically significant pooled smoking association for those two clocks. That narrow null result concerns particular clock outputs; it does not mean smoking has no effect on health or prove there is no relationship with other measures. Fransquet et al., The Journals of Gerontology: Series A, 2019.
How to read the evidence at a glance
| Study | Population and duration | Intervention or evidence | Clock result | Key limitation |
|---|---|---|---|---|
| Fitzgerald et al., 2021 Source | 43 healthy men, ages 50–72; 8 weeks | Diet, sleep, exercise, relaxation guidance, and supplements | Horvath DNAmAge was 3.23 years lower versus control; the intervention group’s 1.96-year within-group decrease was not statistically significant | Small pilot, bundled program, narrow population |
| Shan et al., 2026 Source | Review of 44 studies and 145,465 people; pooled analysis of seven cross-sectional studies | Physical activity | Association with lower Horvath and GrimAge acceleration; pooled Hannum and PhenoAge results not significant | Observational evidence does not establish causality |
| Maier et al., 2025 Source | 777 generally healthy adults aged 70+; 3 years | Factorial trial of omega-3, vitamin D, and home exercise | Omega-3 affected selected second-generation measures; vitamin D and exercise did not show individual clock effects | Small, clock-dependent findings in a selected older population |
| Nishimura et al., 2026 Source | Overweight men aged 50+; 12 weeks | Exercise and dietary guidance plus probiotic yogurt | Exploratory 2.2% DunedinPACE estimate; no clock remained significant after multiple-comparison correction | Short, exploratory trial; durability is not established |
Can exercise lower your biological age?
Activity is associated with lower values on some DNA-methylation clocks, but the pooled physical-activity evidence is largely observational. In the DO-HEALTH analysis, the home exercise program did not show an individual clock effect, and pooled Hannum and PhenoAge activity results in the 2026 meta-analysis were not statistically significant. The evidence therefore does not establish that exercise reliably lowers a biological-age clock, even though these clock studies do not settle exercise’s broader health effects.
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Does a lower epigenetic age mean you are younger?
No. It means a particular algorithm returned a different estimate from a biological sample. A clock result is not a direct measure of every aging process, a diagnosis, or proof that a person has become younger in a literal or whole-body sense. Nor does a lower reading by itself demonstrate that an intervention prevents disease or extends life. Interpret it as a change in a specific surrogate measure, with the study design and population in view.
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