Four days before Dolly Parton died, she was still planning. She was 80. She had written thousands of songs, built businesses, made movies, created Dollywood and spent more than six decades becoming one of the most recognizable people in America. She could reasonably have looked backward and decided there wasn’t much left to accomplish.

Instead, she told people she still had “so many things” she wanted to achieve. Four days later, she was dead.

I know this differently than most people do, because I am a radiation oncologist. For 36 years, I have sat across from people with cancer while they talked about what came next. Sometimes that meant radiation or chemotherapy. Just as often, it meant a daughter’s wedding, a trip already booked, a grandchild arriving in December or whether they would be strong enough to get back into the garden in spring. I have heard each of these in the last month.

When I was younger, I assumed serious illness would change the way people thought about time. I imagined that once the stakes became high enough, the future would begin to recede and the present would take over. That isn’t what I have seen. People can understand that they are seriously ill and still make plans. They can discuss a frightening scan and then ask whether treatment will interfere with a vacation. They can know that a cancer is incurable and still wonder what they should buy their spouse for Christmas.

This isn’t necessarily denial. It is what happens when illness enters a life that is already in progress. The dog still needs walking. Someone needs groceries. The mortgage is due. There is a birthday next month and a friend coming for dinner on Saturday. Even when the medical facts have changed dramatically, much of Tuesday can still look like Tuesday.

On August 21, Parton spoke publicly about going through a difficult period with her health. That same day, she was admitted to Vanderbilt-Ingram Cancer Center in Nashville. She died there four days later. Her representatives said that she had been diagnosed with cancer and described her illness as a brief battle. They have not disclosed what type of cancer she had.

Now that we know the ending, everything before it looks different.

The canceled performance becomes a warning. The missed appearance becomes evidence. A doctor’s instruction not to travel takes on a significance it may not have carried when it was given. Separate events become a sequence, and the sequence begins to look as though it had been pointing toward the same destination all along.

I have watched families do this for years. They ask when things really changed. Was it when she stopped eating as much? Was it the weekend when he didn’t want to leave the house? Should we have understood what the fatigue meant? Was there a moment when everyone should have known?

Sometimes there is an answer. Often there isn’t, because illness is much easier to understand backward than forward. What Parton said four days before her death gives us a glimpse of where her attention still was. She was thinking about what came next.

The medical record looks orderly. Life isn’t.

When I began practicing oncology, I thought of serious illness as a series of recognizable thresholds. Diagnosis. Treatment. Response. Progression. Eventually, for some patients, the point when treatment could no longer do enough.

The medical record encourages that way of thinking. It puts dates beside events and turns a complicated human experience into a chronology that can fit on a screen. Living through illness is different. A scan can worsen while someone continues going to work. A person can receive radiation in the morning and pick up a grandchild from school that afternoon. Someone can understand perfectly well that a cancer is incurable and still make a restaurant reservation six months away. There is rarely a bell that rings when ordinary life becomes something else.

I had a patient once, a woman in her mid-sixties, who came to me complaining that she could no longer walk to the grocery store the way she used to. She had been going there three times a week — a routine that anchored her mornings. Now she was tired halfway there. She asked if radiation therapy would help her get back to it.

I told her the truth: probably not. She nodded, and we talked about treatment options. Six months later, during a follow-up visit, I asked how she was managing. “Oh, fine,” she said. “I order online now.” She had adjusted so completely that she’d already forgotten the walk was ever part of her life at all.

Over the years, I have become increasingly interested in this kind of adaptation. Someone starts taking the elevator instead of the stairs. The afternoon nap becomes necessary rather than optional. A person who always cooked begins ordering food. The weekend that once restored them no longer does. None of these changes feel important enough to mark on a calendar. We simply adjust around them.

What interests me is how long we can do this without realizing how much our world has changed. Life still works, so we assume our capacity hasn’t changed very much. Often it has. We have simply become good at spending less of it.

That observation extends far beyond cancer, which is why I built the Capacity Checkup — a tool that looks at sleep, mood, focus and body to help you see where your reserves may be thinning. Take the free 3-minute Capacity Checkup and see where it makes sense to pay attention first.

There was nothing left for Dolly Parton to prove

She had sold more than 100 million records. Her songs became part of American culture. Her Imagination Library, started in Tennessee, grew into an international program that has put hundreds of millions of books into children’s hands. During the pandemic, she donated $1 million to Vanderbilt University Medical Center to support research on the Moderna COVID-19 vaccine. What interests me is that apparently she wasn’t keeping score. She still had things she wanted to do.

After decades of treating older adults, I have become interested in people who keep something ahead of them — people who don’t think they’re finished. It doesn’t have to be important to anyone else. A trip works. So does a garden, learning a piece of music, seeing a grandchild graduate, finishing a book or getting strong enough to walk somewhere you haven’t been able to walk for a while. The project matters less than the fact that there is still a project. Perhaps that is why Parton’s comment from four days ago caught me more than the lists of awards and accomplishments. She wasn’t describing a completed life. She was describing the next part of it.

Maybe there is something good about leaving things unfinished. Death encourages the people who remain to turn a life into a finished story. I have watched people lose futures they desperately wanted, and there is nothing reassuring about that. But 36 years in oncology have made me see another side of it. Maybe feeling unfinished isn’t evidence that we failed to complete our lives. Maybe it is what being alive feels like.

As long as we are engaged with the world, there is another thing we want to see, make, repair, learn or give to someone else. We keep placing small bets on a future we cannot actually guarantee.

Most mornings, none of us thinks much about that. We make the reservation anyway. We buy the concert tickets. We plant something that won’t bloom for months. We tell someone we’ll see them at Christmas. We begin books we may take years to finish.

Dolly Parton had been doing some version of that for eight decades. She had gone from a one-room cabin in Tennessee to a career almost impossible to summarize. She had written thousands of songs, built companies, made an enormous amount of money and given a great deal of it away. Four days before she died, she was still talking about the things she hoped to accomplish.

After 36 years of watching people live alongside serious illness, I don’t hear that as a story about someone who failed to understand that time was running out. I hear something much more familiar. She still thought there would be a tomorrow. So do we. And most days, that is how we manage to live.