If there is one book I have recommended over the last five years, it is Atul Gawande’s Being Mortal. Immersed as I am in caring for an older parent and surrounded as I am by friends and colleagues sorting out the same questions, this is no surprise. But what is surprising is that in spite of how much this book has helped me, I have to return to its lessons again and again. When my parents entered their nineties, I would return home to the house they shared since 1973. But instead of envying my mother’s ability to have everything sparkling clean and perfectly organized at every moment, I...