What is the 3rd chapter in life?

Harvard Sociology Emeritus Professor Sarah Lawrence-Lightfoot published “The Third Chapter: Passion, Risk, and Adventure in the 25 Years After 50” an excellent book describing her interviews with people 55-65 years old that have rediscovered new and exciting purposes in their lives. Her book inspired me to think of my own transition into this stage, where the biology of aging becomes evident which motivated me to reflect on the different domains that constitute my being (physical, mental, and spiritual) and ways I can harness them.

There is a profound connection in the 3rd chapter with the very popular topic of “healthy aging” and ways people are trying to hack their way to cheat time and be young forever, whatever their own definitions of young are.