Women May Begin Losing Muscle in Their 30s
New research links early muscle changes with later differences in strength, power, walking and fitness.
Muscle loss may begin earlier in adulthood than many women expect. A study in Age and Ageing examined adults from age 30 through 69, along with people 70 and older, using a precise test for total skeletal muscle. The findings point to the 30s as a possible starting point for decline.
The pattern was not the same for women and men. Men showed a steadier drop in muscle that matched changes in physical ability. Women could have relatively steady muscle amounts while strength, explosive ability and aerobic fitness still worsened. That gap suggests the condition of muscle may matter as much as its size.
Researchers also compared muscle with leg strength, walking speed, leg power and peak oxygen use. Their results indicate that muscle quantity has been undervalued when assessing changes in everyday function. The study supports maintaining or building muscle across adulthood, including through strength work added to an existing exercise routine. It also suggests that waiting until later midlife to focus on muscle may miss an earlier window for preserving mobility and healthy aging.
- The research included adults ages 30–69 and people 70 and older.
- Researchers used D3-creatine dilution to estimate total skeletal muscle.
- Women’s fitness and strength declined even when muscle amounts looked stable.
- The study appeared in Age and Ageing.
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