A Answers (2)
Mehmet Oz, MD, Cardiology, answeredMuscle mass declines with age. This starts to occur more rapidly in your 40s and at an even faster rate in your 50s. Recent studies suggest that at 40, women lose muscle mass twice as fast as men. You lose the most muscle mass on the body's largest surface areas like the core muscles supporting your shoulders and belly, as well as your thighs.
National Academy of Sports Medicine answered
There may be several reasons as to why you're losing muscle mass. Losing some muscle mass is a result of aging. However, sedentary living, poor dietary habits, and chronic disease can play a major role to your loss of muscle. After speaking to your primary care physician, it is important to adopt a physical activity program that includes strength training and weight-bearing cardiorespiratory activities such as walking, jogging, or even dancing to help preserve and even grow muscle. Strive for a minimum of 150 minutes of physical activity per week.