> It's easier to build muscle mass before the age of 30 and the muscle you gain during that time will never go away (with a minimum of training). Why would tha

> It's easier to build muscle mass before the age of 30 and the muscle you gain during that time will never go away (with a minimum of training). Why would that not also be true of muscle you build later in life? It might be harder to acquire it, but it should be similarly long-lasting.