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FUNCTION: Turn Your Blind Spots into Strengths
Do you know where your healthspan stands today? Would you like to be able to measure and track it with confidence? Thanks to new research, there’s now a way—FUNCTION shows you how by turning what your body and mind can actually do each day into a clear, actionable measure of Functional Age.
Grounded in longitudinal studies of more than 700,000 adults over five decades, this portfolio-style view of functional capacity explains why some people move and think years younger than their birth certificate—and how you can, too. Instead of one-size-fits-all tips or abstract scores, FUNCTION gives you a personal healthspan scorecard built from simple self-assessments you can perform at home in minutes, with no lab work, wearables, or special devices required.
Across five domains of physical and cognitive ability, you’ll complete 44 research-based tests that reveal your strongest reserves and your hidden blind spots, then show how your results compare with healthy norms for your age. You will see your Functional Age, understand why it outperforms bodyweight, step counts, and biological-age estimates as a predictor of how well you will live, and learn how to lower that age using activities you already do in everyday life.
In these pages you will learn how everyday movements and mental tasks into reliable indicators of current and future healthspan.Turn your results into a simple, repeatable plan to strengthen specific domains without overhauling your entire lifestyle.Use periodic re-testing to track real progress over months and years, so you always know whether your choices are adding capable years to your life.FUNCTION is a practical, evidence-based field guide for anyone who wants to stop guessing about aging, see their true capacity in black and white, and build a future they can count on—one they are strong enough, sharp enough, and confident enough to fully enjoy.
Grounded in longitudinal studies of more than 700,000 adults over five decades, this portfolio-style view of functional capacity explains why some people move and think years younger than their birth certificate—and how you can, too. Instead of one-size-fits-all tips or abstract scores, FUNCTION gives you a personal healthspan scorecard built from simple self-assessments you can perform at home in minutes, with no lab work, wearables, or special devices required.
Across five domains of physical and cognitive ability, you’ll complete 44 research-based tests that reveal your strongest reserves and your hidden blind spots, then show how your results compare with healthy norms for your age. You will see your Functional Age, understand why it outperforms bodyweight, step counts, and biological-age estimates as a predictor of how well you will live, and learn how to lower that age using activities you already do in everyday life.
In these pages you will learn how everyday movements and mental tasks into reliable indicators of current and future healthspan.Turn your results into a simple, repeatable plan to strengthen specific domains without overhauling your entire lifestyle.Use periodic re-testing to track real progress over months and years, so you always know whether your choices are adding capable years to your life.FUNCTION is a practical, evidence-based field guide for anyone who wants to stop guessing about aging, see their true capacity in black and white, and build a future they can count on—one they are strong enough, sharp enough, and confident enough to fully enjoy.
205 pages, Kindle Edition
Published January 13, 2026
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