To tell the truth, the book title is one big hook.
Shields writes about our physical progress and regress from conception to death. It’s a tale of what happens to our body and mind as we get older. He also intersperses anecdotes from his life and those of his father, who is slowing just a bit in his 90’s and provides quotes from a variety of people on aging and death.
As a 55 year old man, I got to wax nostalgic about what I experienced (or missed) from my “youth.” I also got to read what I can expect to experience as I get older. (My hearing, sight, sense of taste and touch will change for the worse.)
Normally I find books like these boring and to be honest, quite depressing. However I enjoyed reading the book from cover to cover. It made me more meditative than melancholy.
"Older" readers may appreciate the information and wisdom found in the book a bit more than younger readers.