Aging is not, as the cliché goes, for the faint of heart. If a woman makes it to 65, she can expect to live at least 20 more years. Three new books written by or about the elderly provide a wonderful roadmap to aging with grace, introspection, gratitude, and humor. “Coming of Age: My Journey to the Eighties” by Madeleine May Kunin The former Vermont governor and ambassador to Switzerland has authored books about politics, feminism, and women as leaders. In her new memoir, she has blossomed into an essayist and poet. Kunin, who is 85, muses about defying “death’s black raven” on her shoulder. The color red is one way to achieve this. She bought a Barcelona Red Prius…