Biological Age Tests

Biological Age Tests

Setting Your Health Baseline: How Old Am I? Biological Age Tests

Biological age tests determine how old your physical body is, in contrast with your calendar age. They are necessary to set your health baseline so you can measure if treatments actually reverse aging.

“We are living in exciting times. Several treatments appear to reverse epigenetic aging.” — Dr. Steve Horvath, leading biological clockmaker

Biological Age Test History

Biological age testing is a young field, with the first epigenetic clock being created in 2009 by Axel Schumacher followed in 2013 by significant advancements to use multiple tissue samples by doctors Gregory Hannum and Steve Horvath. With first-generation DNA methylation-derived epigenetic clocks, it is possible to take cell samples, analyze them using these clocks, and accurately guess the donor’s calendar age within 3.6 years

Alternate methods to estimate chronological age using transcriptomic and proteomic data, saliva or telomere length, have proven less accurate as there are multiple challenges in biological age testing.

Biological Age Tests — How Fast Am I Aging?

According to Dr. Horvath, “Aging manifests in 30 year olds.” If you are fortunate enough to be just 30 years old, you should consider taking a biological age test to set your health baseline. If you are older, it still makes sense to establish a starting position, then test annually to see how you progress. 

Dr. Horvath’s latest technology includes PhenoAge and GrimAge from the non-profit Clock Foundation. GrimAge provides epigenetic clock testing for physicians and aging researchers for preclinical and clinical studies. It is considered the best estimation of all-cause mortality as the rate of change in GrimAge shows an increased hazard ratio for predicting death. If the rate of change moves up quickly, you are likely in trouble and should seek medical help.

GrimAge has received global scientific validation for accuracy in tracking age. As of 2019, GrimAge is 18% more accurate than calendar age and 14% better than previously-described epigenetic biomarkers. In predicting time to coronary heart disease, GrimAge is 61% more accurate than chronological age and 46% better than previously-reported epigenetic biomarkers. Also, GrimAge outperforms in predicting time to cancer and time to menopause. Of note, if patients are sick when taking the GrimAge test, it affects the results because blood health factors show the illness.

Dr. Horvath has found that blood and buccal (cheek swab) cells are the best indicators for testing aging. For comparison, they are also testing animals such as cats, dogs and even elephants.

Biological Age Tests — Available for You!

Unfortunately, GrimAge is not providing direct to consumer testing at this time. Here are publicly available biological age test options:

Aging AI (free)

  • Enter your results online from a basic blood test.
  • Provides accuracy within 5.5 to 5.9 years depending on the amount of data entered.

Glycan Age ($348)

  • At-home finger-prick blood test which is mailed back in.
  • Glycans are sugar molecules that surround and modify proteins in your body. Glycan Age claims they respond to your lifestyle choices and indicate the inflammatory state of your immune system, which in turn determines your biological age.
  • They believe measuring the amount of good and bad glycans can determine biological age.
  • Good glycans decrease with age. Bad glycans increase.
  • Their accuracy level is unclear. They are trying to benchmark against telomere lengths of a variety of cells.
  • Their results have large variations (up to 38 years in one of their examples) against chronological age. They do not have mortality studies.
  • Testing a single indicator (glycans) is unlikely to accurately reflect all aspects of biological aging.

Index by Elysium ($299-$499)

  • At-home saliva-based epigenetic test kit developed by Professor Morgan Levine, Ph.D., at Yale School of Medicine and former employee in Horvath’s lab.
  • Analysis of 100,000-150,000 biomarkers using an Illumina chip, an upgrade on her work creating PhenoAge (considered the second clock) in Dr. Horvath’s laboratory.
  • Epigenetics involves changes in your biology caused by modifications in gene expression rather than the underlying genetic code itself. Factors that can influence your epigenetics include your diet, exercise habits, alcohol consumption, and stressors like sleepless nights.
  • Provides biological age plus Cumulative Rate of Aging, the pace at which your body has aged for every year you’ve been alive.

InnerAge from InsideTracker ($179 plus $99 for each additional person on the plan)

  • Tracks 14 biomarkers for women and 18 for men
  • Combination of advanced bloodwork (blood test included) and lifestyle factors
  • Provides results as Personalized optimal zones – Based on your age, gender, ethnicity, activity levels and goals. Indicates impact on your biological age from each marker.
  • Offer premium “Ultimate” plan with 43 biomarkers for $589
  • Offers a nutrition database with over 7,500 food items scientifically proven to improve specific biomarker levels. Additionally, receive advice on hundreds of supplements as well as lifestyle and exercise suggestions to help you reach your optimal zones.

Levine Phenotypic Age (free)

  • A downloadable spreadsheet to enter 9 factors from blood work results
  • Developed from studies on over 11,000 adults
  • Calculates your phenotypic age and expected mortality

LifeLength — telomere length testing ($480)

  • Short telomeres are associated with many age-related illnesses and declining health.
  • Telomere length is not accurate for predicting mortality.

myDNAge — based on the first generation version of the Horvath Clock

  • Blood and urine tests ($299 each)
  • Company is not affiliated with Dr. Horvath
  • Claims to be the Most Accurate Biological Clock, but provides no evidence
  • Target over 2,000 CpG sites, much fewer than competitors

PhotoAgeClock (not publicly available)

  • Based on left and right eye photos of over 8000 people.
  • Mean-Average Error rate within 2.3 years. Varies by age of participant.
  • Not considered official because it doesn’t use cellular biomarkers. 

Real Age (free) online questionnaire and results

  • Created in 1999 by Dr. Michael Roizen, Chief Wellness Officer of the Cleveland Clinic
  • Currently owned by Sharecare, an health and wellness platform
  • 15-20 minutes to answer questions about your health and lifestyle
  • 45 million people have taken it
  • Provides your “real age” and tips to improve your health
  • Of note, they recommend daily aspirin. See Keep Health’s article for the risks.

Tru Me Labs ($99)

  • At-home mail-in DNA-based saliva epigenetic test kit.
  • Uses methylation on only a tiny fraction of the billions of nucleotides in your DNA and is subject to statistical error of approximately 4.75 years.
  • Only provides your calculated biological age as a result.

Young.ai (free) iPhone app from Hong Kong–based Deep Longevity and Dr. Polina Mamoshina

  • Tracks multiple biological clocks, using biomarkers that show the rate of aging at the molecular, cellular, tissue, organ, and system level. 
  • Users upload their data from photos, surveys, biological samples, and activity trackers into an AI system which provides a personalized to-do list to promote healthier aging.
  • Believe their AI method will be more powerful than Horvath’s models for detecting aging.
  • 5 most important predictors; (Albumen) liver function, metabolic function (glucose), urea (renal), erythrocytes (respiratory), hemoglobin. (Side note: Dr. Horvath — agrees with Dr. Polina on these targets.) Facial features, microbial taxa can be factored in too.
  • Smoking under the age of 40 has much more impact on human aging than after that.
  • Accuracy between 6-7 years. Expected to improve rapidly with more datasets.

Best Articles Comparing Biological Age Tests

The following authors have written good articles on their experiences using some of the above biological age tests.

Anti-Aging Clinical Trials

The following clinical trials are using biological clocks to measure the impact on aging.

TRIIM by Greg Fahy and Robert Brooke

  • Phase 1 initial study on 9 people showed a 2.5 year reduction in GrimAge using a cocktail of thymus gland treatment drugs.
  • Phase 2 results from 85 participants are expected in Oct 2021 and Oct 2022. The study uses multiple agents in combination with personalized doses of recombinant human growth hormone (somatropin), metformin, and DHEA.

Nicotinamide Riboside (NR) in Hospitalized Patients (2019)

  • Investigating the potential benefits of 90 days of NR supplementation on recovery time and mortality using GrimAge.
  • Preliminary results in December 2021 and End of Study results in December 2022.
  • For more on the benefits and safety profile, see Keep Health’s NR article.

Also, multiple researchers are working on a CellAgeClock to track aging in single in-vitro cells for the purpose of testing new anti-aging drugs

Databases of Genes which Impact Aging

For the curious, here are two public databases maintaining the known list of genes which impact aging. 

GenAge — database of genes which impact aging

SynergyAge — a curated database to examine the combination of multiple genes on lifespan, seeking to identify synergistic and antagonistic interactions of longevity- associated genes via BioRxiv.org (BioArchive). Run by Gabriela Bunu, PHD student at the Romanian Academy. 


This concludes our article comparing biological age tests. As your reward for reading and to satisfy your curiosity, we recommend you go try Real Age for free, then consider InnerAge as well. 

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