Aging is happening quietly. You can change the pace.
Vital Years Ahead is a functional-medicine roadmap for slowing biological aging, reversing hidden decline, and extending the years you actually feel well — built from two decades of clinical practice.
“Most people don’t notice decline until it has been underway for a decade. The point of this book is to make it visible — and then to do something about it.”
Six shifts that decide how well you age
Your real age
Biological vs. chronological age, and the markers that actually track it.
The hidden decline
Why “normal” bloodwork misses the decade in which decline sets in.
Metabolic ground floor
Insulin, inflammation, and the terrain everything else is built on.
Hormones over time
What shifts, what to measure, and when replacement is warranted.
Testing that earns its place
The functional panels worth running — and the ones that aren’t.
The protocol
A sequenced plan you can start this week and sustain for decades.
Dr. John Dempster, ND
Board-certified Naturopathic Doctor and founder of The Dempster Clinic — Center for Functional Medicine in Toronto. His practice centres on optimal aging: using functional testing to optimize the biochemical, metabolic, and hormonal systems that quietly govern how long you stay well.
He is a Board Certified Fellow in Anti-Aging, Regenerative, and Functional Medicine, a sought-after speaker, and co-founder of The Mental Wellness Summit.
Download the Vital Years
To help you get the most out of my book, I’ve created a free Vital Years Assessment.
This quick and insightful self-assessment will help you identify your biggest opportunities for healthy aging and give you a personalized starting point before you dive into the book.
The years ahead are still yours to shape.
Order Vital Years Ahead today, in print, ebook, or audio.