The Study
Biological age-acceleration in relation to muscle mass, strength and function: findings from the Hertfordshire Cohort Study.
This study looked at whether people whose bodies seem to be aging faster than their real age also have weaker muscles. It found a link, but it doesn't prove that faster aging makes muscles weaker—maybe weaker muscles make the body age faster, or something else like diet or exercise is causing both.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Scientists measured how fast people's bodies are aging using a blood test, then checked if faster aging meant weaker muscles or slower walking.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 559 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The grip strength drop is small but meaningful — like losing a bit of ability to open jars or carry groceries.
- 2The sarcopenia score increase suggests women with faster biological aging may lose more muscle functions overall.
- 3In men, faster biological aging linked to 16% weaker grip strength.
- 4In women, faster aging linked to 20–23% higher chance of having multiple muscle problems.
- 5No link found for muscle mass or walking speed.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Aging clinical and experimental research
Year
2026
Authors
F. Laskou, L. Westbury, N. Kitaba, J. Holloway, E. Dennison, N. Fuggle
Related Content
Claims (6)
As people get older, they naturally lose muscle and bone mass at a faster rate than when they were younger.
In men aged 65 and older, higher biological age acceleration measured by DNA methylation is linked to lower grip strength, with each one-standard-deviation increase in biological age acceleration associated with a 0.16-standard-deviation reduction in grip strength.
In older adults, faster biological aging is linked to weaker grip strength in men and to lower muscle quality scores in women, suggesting that aging affects muscle function differently by sex.
In women aged 65 and older, faster biological aging is linked to a greater number of muscle decline markers.
In people aged 65 and older, the rate of biological aging measured by DNA methylation patterns does not correlate with muscle mass in the arms and legs or walking speed.
DNA methylation patterns in blood that indicate accelerated biological aging are linked to weaker hand strength in men and lower overall sarcopenia scores in women, but not to reduced muscle mass or slower walking speed.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.