I'm 40 years old, having been a gamer since I was 10. I'm also a husband, a home-owner, have held a professional job for over years, and I don't personally have any difficulty reconciling my love of fantasy and role-playing games with my normal, day-to-day life. It seems that the author has had difficulty in this, and this book seems to be essentially his rambling and occassionally awkward attempt to find out if it's possible to be both mature and have a love of geeky, escapist hobbies.
If you're someone who put the dice away a long time ago and are wondering whether it's okay to feel like dusting them off again...or if you never were involved in such hobbies and are wondering if it's okay for your significant other to be...then this book may be written just for you.
If you're still avidly into these pursuits, then you may come away from this book feeling a bit unsatisfied. I felt like I'd read a book that said "It's okay for you to be into this stuff", and I was saying, "Well...yeah. I knew that. Thanks." It's still worth reading the book, as he has a lot of enjoyable stories along the way...just don't hold your breath for any deep revelation at the end.