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How Old Are You Really?

Find Your True Age with the Zest Functional Age Test

Chronological Age is just a number, marking the years since your birth. But how young do you feel?

Your Functional Age reflects how well your body and mind are actually functioning compared to your chronological age. Unlike traditional age measures, it captures your physical and cognitive health.

Get Started
Black box, white text, identifying a link to download the Zest app from the Apple app store.

Why is our functional age test better?

Yearly
Zest Functional Age Test
GlycanAge Test
Epigenetic Age Test
E.g DunedinPACE
Telomere Length Test
PhenoAge
Test
InsideTracker
Inner Age 2.0
Includes markers of brain health
Includes markers of heart health
Correlated with lived experience
Well correlated
Untested
Moderately correlated
Not correlated
Not correlated
Untested
Gives actionable advice on how to improve
How long before changes are seen
3 months
6 months
1+ years
2+ years
6 months
6 months
Number of biomarkers included in score 
21
9 Blood, 9 Digital,
3 Functional
1
1
1
9
13
Cost
$179 USD
$362 USD
$350 USD
(Average)
$300 USD
$75 USD
$348 USD

Why Choose Zest Functional Age Test?

Accurate Assessment

Our AI-powered test uses over 30 biomarkers, including blood biomarkers giving you a comprehensive view of your health.

Actionable Insights

Receive personalized advice to optimize your health based on your test results.

Short-Term Feedback

See measurable changes within months, keeping you motivated and on track.

Reflects Lived Experience

Correlates with how you actually feel, not just a number on paper.

How Functional Age Testing Works

How Functional Age Testing Works

Blood Biomarkers

Digital Biomarkers

Functional Biomarkers

Blood Biomarkers

Measure key indicators like cholesterol, hormone levels, and inflammation via a simple finger prick test. These biomarkers provide a snapshot of your internal health, allowing us to assess your risk for conditions like cardiovascular disease and diabetes, as well as overall physiological age.
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Position, Company name

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GET STARTED

Ready to See Your Functional Age?

FREE
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Transform your approach to health with Zest.
Understand your body’s true age and get actionable insights to feel younger and healthier.

Black box, white text, identifying a link to download the Zest app from the Apple app store.
Image of hands holding an iphone, displaying zest's longevity tracking app, showing daily score.

Traditional epigenetic clocks and DNA-methylation based biological age calculations

  • Developed for research purposes, not designed for consumer use [1]
  • Do not change even when users follow protocols known to extend lifespan such as exercise and calorie restriction [2, 3]
  • Poorly correlated with lived experience. Many studies have shown that lower epigenetic age is NOT linked to improvements in cardiorespiratory fitness, walking speed, muscle strength and various other functional measures [4 5 6].
  • Does not offer granularity as to which aspects of your health are bringing down your age and how to improve them, since it is just one overall number.
GET STARTED

Zest Functional Age calculation:

  • Developed alongside leading researchers from the University of Cambridge specifically for use in consumer longevity science, not just in theoretical research.
  • Will change on a short-medium term basis (within 3 months) if you implement a health-optimizing routine.
  • Inherently linked to your physical and cognitive functionality, so as your fitness and performance improves, you will see that reflected in your Functional Age.
  • Offers a breakdown of how you scored in physical, cognitive and functional biomarkers to help you develop a targeted longevity protocol to improve your Functional Age.
GET STARTED

Why Choose Zest Functional Age Test?

Accurate Assessment

Our AI-powered test uses over 30 biomarkers, giving you a comprehensive view of your health.

Actionable Insights

Receive personalized advice to optimize your health based on your test results.

Short-Term Feedback

See measurable changes within months, keeping you motivated and on track.

Reflects Lived Experience

Correlates with how you actually feel, not just a number on paper.

How Functional Age Testing Works

Blood Biomarkers

Measure key indicators like cholesterol, hormone levels, and inflammation via a simple finger prick test.

Digital Biomarkers

Track VO2 max, heart rate variability (HRV), and sleep quality using wearable technology.

Functional Biomarkers

Assess cognitive function and physical strength through tests like grip strength and memory challenges.