S. Jay Olshansky, one of the leading experts on aging, argues that life expectancy is now leveling off. “We have arrived at a moment,” Callahan and Nuland conclude, “where we are making little headway in defeating various kinds of diseases. Instead, our main achievements today consist of devising ways to marginally extend the lives of the very sick.”

Others disagree with this pessimistic view of medical progress. But that phrase, “marginally extend the lives of the very sick,” should ring in the ears. Many of our budget problems spring from our quest to do that.

The fiscal implications are all around. A large share of our health care spending is devoted to ill patients in the last phases of life. This sort of spending is growing fast. Americans spent $91 billion caring for Alzheimer’s patients in 2005. By 2015, according to Callahan and Nuland, the cost of Alzheimer’s will rise to $189 billion and by 2050 it is projected to rise to $1 trillion annually — double what Medicare costs right now.

Obviously, we are never going to cut off Alzheimer’s patients and leave them out on a hillside. We are never coercively going to give up on the old and ailing. But it is hard to see us reducing health care inflation seriously unless people and their families are willing to do what Clendinen is doing — confront death and their obligations to the living.

There are many ways to think about the finitude of life. For years, Callahan has been writing about the social solidarity model — in which death is accepted as a normal part of the human condition and caring is emphasized as much as curing.

In the online version of this column let me provide links to three other essays, which offer other perspectives on why we should accept the finitude of life and the naturalness of death. They are: “Born Toward Dying,” by Richard John Neuhaus, “L’Chaim and Its Limits: Why Not Immortality?” by Leon Kass and “Thinking About Aging,” by Gilbert Meilaender.

My only point today is that we think the budget mess is a squabble between partisans in Washington. But in large measure it’s about our inability to face death and our willingness as a nation to spend whatever it takes to push it just slightly over the horizon.