Muscle mass and strength decline after age 30-40

Medical experts and health organizations warn that muscle mass and strength typically peak between ages 30 and 35, followed by a progressive decline. Research indicates that muscle mass can decrease by approximately 8 percent per decade starting around age 40.

To combat sarcopenia—the age-related loss of muscle mass and function—experts recommend resistance training, a balanced diet, and maintaining daily movement. For those over 40, strength training is vital to preserve mobility and metabolic health. However, medical institutions such as the Mexican Institute of Social Security (IMSS) suggest that individuals with chronic conditions should seek medical clearance before starting intensive regimens.

Effective training strategies include performing two to three sets of 10 to 15 repetitions on non-consecutive days, ensuring at least 48 hours of rest between sessions for the same muscle group. Maintaining a moderate caloric deficit and prioritizing protein intake can also help manage body composition and prevent excessive abdominal fat accumulation, which often increases due to hormonal changes and reduced activity in middle age.