I would say, rather, "...to which we don't differentially attribute causes other than the passage of time." The distinction is important to me, because it gets at what I expect progress in fighting "aging" to look like: as we understand more about the causes and characteristic properties of various physical and mental changes, we are less inclined to describe them as caused by "age" in some vague handwavy way, even if they normally come with the passage of time... we will think of them as caused by a wide range of mostly unrelated diseases and syndromes, all of which happen to become more likely as we age for various different reasons. And as we learn to prevent or treat those changes, we won't think of that as defeating "aging," we will think of it as defeating those specific diseases and syndromes. After a few generations of this, we will not think of ourselves as having made any progress on defeating "aging", even though most people will live longer healthier lives than their grandparents did.