The quote has mostly to do with risk taking and comfortability that age makes us inclined to adjust. Basically, our habits and creature comforts have a way of making us too complacent and out of touch. Even the best of us can turn into miserable old pricks if we don't take risks and go outside our comfort zones. Even heroes. Heroes die young. So do villains. But an old hero is mighty suspect. Old age isn't due to skill always - sometimes it is due to lack of risk taking - which is a heroes job..