Strength Trends Across the Adult Lifespan

Researchers looked at strength in a huge group of adults. They gathered data from 76,514 people aged 20 to 93. The group included 13,792 men and 62,722 women. They tested several muscle actions: leg press, chest press, seated row, trunk extension and trunk flexion. All measurements were isometric, meaning the muscle length stayed the same while force was applied.

The results were split into five‑year age blocks. For each block they gave the median strength and the spread (interquartile range) in newtons. They also calculated how much strength changed from the youngest to the oldest group, expressed as a percentage difference.

Peak performance showed up between the ages of 25 and 44 for both sexes. From the youngest to the oldest participants, men lost roughly 23% to 40% of their strength, while women lost about 21% to 45%. The chest press told a different story: men’s strength dropped by about 57% across the lifespan, a larger gap than seen in the other tests.

Because the study is cross‑sectional, it shows a snapshot, not a cause‑and‑effect chain. Still, the numbers can serve as a reference for trainers, clinicians, or researchers who need baseline values for similar tests. What might these patterns tell us about staying active as we get older? Think about how strength changes could influence daily life and health.