Results in Days, Not Weeks

Your Blood Tells You
How Fast
You're Aging

PhenoAge is a biomarker of aging developed by Dr. Morgan Levine and Dr. Steve Horvath. It uses 9 clinical biomarkers from a simple blood test to calculate your biological age—strongly correlated with onset of age-related diseases and mortality.

Order PhenoAge Test Learn the Science
Fast Results
Simple Blood Test
Peer-Reviewed Science
PhenoAge Results
Sample report preview
42.3
years

Biological Age

5.7 years younger than chronological age

Chronological
48
Difference
-5.7 yrs
9 Biomarkers Analyzed
Albumin
4.2 g/dL
Creatinine
0.9 mg/dL
Glucose
92 mg/dL
CRP
1.2 mg/L
Lymph %
32%
MCV
88 fL
RDW
12.8%
Alk Phos
62 U/L
WBC
5.8 K/uL
The Biomarkers

Nine biomarkers. One powerful age score.

PhenoAge combines 9 clinical biomarkers found to strongly correlate with aging and mortality into a single, validated biological age score.

Albumin

Liver function and nutrition status. Low levels are associated with increased mortality risk.

Creatinine

Kidney filtration capacity. Reflects how well your kidneys are clearing waste from the blood.

Glucose

Metabolic health and insulin sensitivity. Elevated levels accelerate biological aging.

C-Reactive Protein (CRP)

Systemic inflammation marker. Chronic inflammation is a key driver of accelerated aging.

Lymphocyte Percentage

Immune system strength. Declining lymphocyte counts signal immune system aging.

Mean Cell Volume (MCV)

Red blood cell health. Abnormal cell size indicates nutritional deficiencies or blood disorders.

Red Cell Distribution Width (RDW)

Cellular aging variation. Higher variability in red blood cell size is linked to faster aging.

Alkaline Phosphatase

Liver and bone metabolism. Elevated levels may indicate liver stress or bone turnover issues.

White Blood Cell Count

Immune response activity. Elevated counts can indicate chronic inflammation or infection.

These biomarkers are obtained from standard blood panels (CBC + CMP + CRP) available at any major lab.
Simple Process

From blood test to biological age in three steps

1
Get a Blood Test

Visit any Quest Diagnostics location or use your recent blood work. Standard CBC, CMP, and CRP panels are all that's needed.

2
We Calculate Your Age

Our algorithm applies Dr. Levine's validated PhenoAge formula to your 9 biomarkers, computing your precise biological age.

3
Get Your Report

Receive your biological age score, biomarker breakdown, personalized recommendations, and optional consultation.

Already have blood test results?

Upload them directly at our PhenoAge Analysis page for instant results. No waiting, no additional lab visits needed.

Upload Blood Test Results
What's Included

Everything you need to understand your aging

Lab Blood Test

Administered by Quest Diagnostics (US) or select UK locations. Standard panels that capture all 9 PhenoAge biomarkers.

  • CBC with differential
  • Comprehensive Metabolic Panel
  • High-sensitivity CRP

Biological Age Report

A comprehensive analysis of your biological age with actionable insights for health optimization.

  • Your PhenoAge score
  • Individual biomarker analysis
  • Age-matched population comparison
  • Personalized health recommendations

Follow-up Analysis

With a second test, track how your interventions are impacting your biological age over time.

  • Before and after comparison
  • Treatment impact measurement
  • Lifestyle change assessment
The Science

Developed by leading
aging researchers

PhenoAge was developed in 2018 by Dr. Morgan Levine, Dr. Luigi Ferrucci (National Institute on Aging), and Dr. Steve Horvath (UCLA). Published in the journal Aging, the study analyzed data from over 9,000 individuals in NHANES III.

The algorithm identifies patterns in 9 standard blood biomarkers that together create a composite measure of biological aging. Unlike your birth date, this score reflects your actual physiological state and can be improved through lifestyle interventions.

PhenoAge was found to predict all-cause mortality, cancer, healthspan, physical functioning, and Alzheimer's disease risk—making it one of the most comprehensive blood-based aging biomarkers available.

Peer-reviewed research
9,000+ participants
Landmark Paper

"An Epigenetic Biomarker of Aging for Lifespan and Healthspan"

PhenoAge was found to predict all-cause mortality, cancer, healthspan, physical functioning, and Alzheimer's disease risk—outperforming previous blood-based age estimators across all measured outcomes.

Levine, Lu, Quach, et al. • Aging (Albany NY), 2018
9,000+
Participants Validated
12+
Disease Outcomes Predicted
2018
Published, Peer-Reviewed
Global
Used by Researchers
Research institutions
UCLA NIH / NIA Yale Stanford
Compare

Which test is right for you?

Both PhenoAge and GrimAge measure biological age, but they use different approaches. Here's how they compare.

Feature PhenoAge GrimAge
Sample Type Blood draw at lab At-home blood collection kit
What It Measures 9 clinical biomarkers DNA methylation patterns
Results Timeline Days 4-6 weeks
Best For Quick baseline, regular monitoring Deep epigenetic insights, mortality prediction
Price Range $ Affordable $$$ Comprehensive
Actionable Components 9 biomarkers 7 risk factor systems

Want the deepest insights into your epigenetic age?

Explore GrimAge Testing

Know your biological age
in days, not weeks

A simple blood test reveals how fast you're aging—and what you can do about it.

Order PhenoAge Test Upload Existing Blood Work

Private & Secure • Results in Days • Peer-Reviewed Science

FAQ

Common questions

Everything you need to know about PhenoAge and biological age testing from a blood sample.

What is biological age?
Biological age is your age on a cellular level compared to your chronological age. While your birth date is fixed, your biological age reflects how well your body is actually functioning. Unlike chronological age, biological age is modifiable through lifestyle changes such as diet, exercise, sleep, and stress management.
What is PhenoAge?
PhenoAge is a biomarker of aging developed in 2018 by Dr. Morgan Levine, Dr. Luigi Ferrucci, and Dr. Steve Horvath. It uses 9 clinical biomarkers from a standard blood test to estimate your biological age. The algorithm was validated on over 9,000 individuals and predicts all-cause mortality, cancer risk, and age-related disease onset.
What blood tests do I need?
You need three standard panels: a Complete Blood Count (CBC) with differential and platelets, a Comprehensive Metabolic Panel (CMP), and a high-sensitivity C-Reactive Protein (hs-CRP) test. These are routine panels available at Quest Diagnostics and most clinical laboratories.
How quickly do I get results?
Results are typically available within a few days of your blood test being processed. If you upload existing blood test results through our PhenoAge Analysis page, you can get your PhenoAge score instantly.
How is PhenoAge different from GrimAge?
PhenoAge uses 9 clinical blood biomarkers from a standard blood draw and gives results in days. GrimAge uses DNA methylation (epigenetic) analysis from an at-home blood collection kit and takes 4-6 weeks, but provides deeper insights into aging mechanisms and mortality prediction. PhenoAge is ideal for quick baselines and regular monitoring, while GrimAge offers the most comprehensive epigenetic aging analysis available.
Can I use blood work I already have?
Yes! If you have recent results that include CBC, CMP, and CRP, you can upload them at our PhenoAge Analysis page for an instant calculation of your biological age. Results should ideally be within the last 30 days for the most accurate assessment.
Where can I get tested?
In the US, we work with Quest Diagnostics locations nationwide—over 2,000 locations for convenient access. In the UK, select laboratory locations are available. Contact us at info@clockfoundation.org for details about your nearest testing location.

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to screen, diagnose, treat, cure, or prevent any disease or condition.