The book is as the subtitle says; "A beginner's guide to the joy of running" but a lot of what you learn there applies across the board to the "adult onset athlete." You will find only one (very minimal) training schedule, no specific eating plans and very few uses of absolutes. The whole gist of the book is learning to take a sensible approach to eating and fitness. This isn't a book for those looking to go couch to 5k or get a better time in their next marathon. It's a book for out of shape people to find a way to make fitness a part of their lives for the rest of their lives.
Admittedly, running is the reason for the book but a practical book on living with our limitations, learning to celebrate our triumphs and learning to set OUR goals has value to anyone wanting to be more active for the rest of their life.