40% muscle mass is well above average for women (36%), and approximating the average percentage for men (42%).* There seems to be a strong genetic component in your case, as your mother (probably around 40-50 now) still has a very decent amount of muscle. read more
The above chart shows the ideal muscle mass percentage one should have, and there is no exact science to what muscle mass you should have, but most experts tend to agree that you should keep your muscle mass in a specific area. read more
My new scale gives me a muscle mass percentage of 37.7 but I've no idea of what is a good % for my age/sex/height. My new scale gives me a muscle mass percentage of 37.7 but I've no idea of what is a good % for my age/sex/height. read more