The book has the potential to be life changing for some men. Our church used it as the core curriculum at a men's retreat. Each teacher took a different chapter to teach, and the response from the 40+ men was tremendous!
I very much enjoyed this book myself and the guys I have shared it with have also really enjoyed it pretty much regardless of age. We hosted a retreat using this materiel, and it was very well recieved.
"Fathered by God" is probably the fifth or sixth book by John Eldredge that I have read. All of them challenge me to grow closer to God. This book examines how God uses our circumstances to lead us into holier living.
Eldridge's book is a powerful reminder of the role we have as fathers and how God the Father can teach us how to be the type fathers/men that we need to be. I strongly recommend it as "must reading" for all men everywhere, regardless of age.