The author of Happiness Is a Choice You Make: Lessons from a Year Among the Oldest Old spent a year interviewing people over 85 in New York City and features six of them in this book, interspersed with relevant statistics. He also tries hard to get each interviewee to share their wisdom, which seems to be less successful than just telling their stories, and I rather applauded the individuals who refused to play.
What I liked best in the book how diverse and unique his elders are. (And why should we be surprised? Old folks are just like us, except, well, old!) He also does a great job of showing how they navigate the obvious physical, mental, and financial obstacles they face in creative and satisfying ways. It’s an inspiring book even if several of the elders are no longer with us.