Squeeze a dynamometer at a clinic or a gym and a single number pops up on the dial. That reading, in kilograms, has become one of the sharpest signals doctors have about how the heart, brain and body are aging.
A systematic review published in December 2024 in the Journal of Sport and Health Science pulled together handgrip data on 2,405,863 adults from 69 countries. It is the most complete map yet of how hard adults actually squeeze, sorted by age and sex.
In the pooled numbers, absolute grip strength peaked in the 30s at 49.7 kg for men and 29.7 kg for women. Values then held roughly flat through middle age before dropping more steeply after 65.
Where your number lands
Peak grip (dominant hand) Also read: How eating sweet potatoes every day can affect your eyes, gut and heart | Age at peak | |
|---|---|---|
Men | 49.7 kg | 30-39 years Also read: The speech change doctors say is an early warning sign of Alzheimer's disease |
Women | 29.7 kg | 30-39 years |
US norms from the NIH Toolbox project, based on 1,232 adults aged 18 to 85, sit in the same territory and are broken down by age, sex and whether the hand is dominant or nondominant.
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What a low number actually means
Grip strength is not just about opening jars. In the Prospective Urban Rural Epidemiology (PURE) study of nearly 140,000 adults in 17 countries, every 5 kg drop in grip was tied to a 16 percent higher risk of dying from any cause. Cardiovascular death rose 17 percent.
That single measurement outperformed systolic blood pressure as a predictor of mortality in the same cohort, as we reported earlier.
The signal reaches the brain too. A UK Biobank analysis of more than 190,000 people, published in JAMA Network Open, tied each 5 kg drop in grip to higher dementia risk. The hazard rose 16 percent in men and 14 percent in women. Vascular dementia showed the strongest signal.
The decline is not fixed
Grip typically slides slowly through the 40s and 50s, then accelerates after 65. But the trajectory bends with training. A physiology review from the American Physiological Society reports that 8 to 12 weeks of resistance training produces 25 to 35 percent gains in leg strength in healthy older adults. High intensity here means above 70 percent of a person's one-repetition maximum.
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Hand strength responds to the same approach. A 2024 network meta-analysis of resistance training in older adults with sarcopenia, the age-related loss of muscle mass and function, found that structured resistance work meaningfully improves handgrip.
Anyone can test at home with a hand dynamometer, seated, elbow at 90 degrees, twice per side. If the number sits well below the age-and-sex norms above, moderate to high intensity resistance training carries the strongest evidence for pushing it back up.
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This article is made and published by Jesper Bengtson, who may have used AI in the preparation.