You asked about McCullough's age, Ella?
"David Gaub McCullough (born July 7, 1933) is an American author, narrator, historian, and lecturer. He is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom, the United States' highest civilian award."
Nostalgia, Ella? I wonder. McCullough has made so many trips to Paris over the years, staying at the Hotel du Louvre, where so many of those mentioned in this book have stayed.
Maybe he has felt loss each time he returns? He can empathize with Saint-Gaudens, perhaps?
Saint-Gaudens finds his friends have left Paris, or died. No one knows him, he knows no one. He can't find what he was missing in America. He isn't at home here. He realizes his home is in America.
Of course he was .an American - his parents came to America, emigrating when he was two. They became citizens. Their baby too. He grew up in New York, leaving for Paris to study when he was sixteen. Returned as a successful sculptor in New York. Probably more American, (if there is such a thing)- than the famous American painter, John Singer Sargent, born abroad of American parents, grew up in Europe, studied traveled and worked in France, Spain, London, Italy. He came home again too...