Quantifying Biological Age

In an earlier post, I wrote about quantifying my biological age with aging.ai (https://michaellustgarten.wordpress.com/2018/06/26/maximizing-health-and-lifespan-is-calorie-restriction-essential/). The importance of that post is illustrated by the finding that based on data from 13 blood tests between 2016 – 2019, my average biological age is 29.2y, which is ~33% younger than my chronological age.

On my quest for optimal health, I’m striving to get as accurate as possible when it comes to quantifying biological age. While the aging.ai biomarker set is strongly correlated with biologic age (r = 0.80), in 2018 two papers were published (Liu et al., Levine et al.) that introduced “Phenotypic Age”, which includes a combination of 9 circulating biomarkers + chronological age that is better at predicting biological age (r = 0.94) than aging.ai. It includes analytes that are found on the standard blood chemistry screen, including albumin, creatinine, glucose, lymphocyte %, mean corpuscular volume (MCV), red blood cell distribution width (RDW), alkaline phosphatase, white blood cells, and an analyte that is not found on that panel, C-reactive protein (CRP). In addition, chronological age is included as a covariate.

So what’s my biological age based on the Phenotypic Age calculator? When I input my data from my latest blood test measurement on 6/4/2019, I get a biological age of 35.39y, which is 23% lower than my chronological age of 46. Not bad!


To quantify your biological age with the Phenotypic Age calculator, input your data in the Excel file that is embedded within the first paragraph of the following link:


If you’re interested, please have a look at my book!


Liu Z, Kuo PL, Horvath S, Crimmins E, Ferrucci L, Levine M. A new aging measure captures morbidity and mortality riskacross diverse subpopulations from NHANES IV: A cohort studyPLoS Med. 2018 Dec 31;15(12):e1002718. doi: 10.1371/journal.pmed.1002718.

Levine ME, Lu AT, Quach A, Chen BH, Assimes TL, Bandinelli S, Hou L, Baccarelli AA, Stewart JD, Li Y, Whitsel EA, Wilson JG, Reiner AP, Aviv A, Lohman K, Liu Y, Ferrucci L, Horvath S. An epigenetic biomarker of aging for lifespan and healthspanAging (Albany NY). 2018 Apr 18;10(4):573-591. doi: 10.18632/aging.101414.


56 thoughts on “Quantifying Biological Age

  1. Johan Knudsen Aardal

    Isn’t this simply a limited view of your “blood age” compared to people eating the Standard American Diet?

    Which doesn’t factor in things like creatine supplementation, whether you worked out the same day as your blood test (potentially increasing CRP) or other confounders.

    Is it saying much beyond than high glucose correlated = bad? Higher albumin = good etc? Where’s LDL particle count for instance, the marker we AFAIK belive is the leading one for development of atherosclerosis?

    Seems like many variables independent of these measurements could point to different biological ages – different tissues could have different biological age profiles. It doesn’t seem useful to generate an overall biological age score just from this, it feels dishonest to me.

    Good to see more research done on blood biomarkers which could help us optimize them, but I do feel the results are being oversold. I remember changing one factor in the aging.ai calc 50% resulting in a ~20 year biological age difference. Not an expert on this topic, so consider these lay observations.


  2. Johan Aardal

    Was hoping you had read it so you could tell me where I’m going wrong, instead of waving me over to the paper 😉 See if I can get around to it this weekend!


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  5. Espen Riskedal

    I want to point out that the spreadsheet you’re linking to does not calculate your PhenoAge but your Phenotypic Age.

    Both are defined in the article by Morgan Levine, and while Phenotypic Age is a combination of 9 blood biomarkers + chronological age, PhenoAge (or more correctly DNAm PhenoAge) is a combination of the DNA methylation value of 513 specific CpG sites. They both try to estimate your “biological age”, and will yield similar results but are not the same.

    If you want to calculate your DNAm PhenoAge you need to measure the DNA methylation levels of your white blood cells and run it through the DNAm PhenoAge algorithm.


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  7. adanazf

    Which are the reference values to calculate the biological age of someone? Where are them coming from? How healthy are the people for such values?


    1. Michael Lustgarten Post author

      Hi Natasha, yes, it can be used from women-the data was derived from NHANES III, which included data for men and women.


  8. Andy

    Very interesting, thanks Michael. Do you know if I can use this biological age calculator on my blog/social media for my followers? I was thinking it’s Dr. Levine’s and other people’s work and they would be the only ones allowed to distribute the equation.


    1. Michael Lustgarten Post author

      Levine’s group published their algorithm for measuring biological age-it’s not proprietary info. So thankfully, we can all use it! Feel free to post it wherever you like…


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  13. Nikos

    Hi Michael, I was doind some tests with the spreadsheet. Using your blood test values shown in this post and inserting them to the linked excel spreadheet gives me a different Phenotypic Age score (37.11) than the one you show us here (35.39). Could you please check this out and let me know? Thank you!


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  16. Kovas Palunas

    For anyone who either prefers Google sheets or doesn’t have Excel, I wrote a custom function for Google sheets that calculates biological age at https://script.google.com/u/0/home/projects/1K6O05-Vdr68hN6IQU3rROw08Pyi4mCv8Wc0NSVu-XXIgxC-mvb6RDP9g/edit, used in the spreadsheet at https://docs.google.com/spreadsheets/d/1ZhbaKATK2hERSFHq21pJ1fqn-EVKtMqIU1iv2Z01_EY/edit?usp=sharing. This has the added plus of taking up less spreadsheet space, which makes it easier to track results across multiple tests.

    One peculiarity is that I’m getting a very low biological age for my own data (in the sheet). This matches the result I get from the original sheet linked in this post (converted to google sheets): https://docs.google.com/spreadsheets/d/1rzcPDl0aprLzBQNJf8B7vH6MpiQ4A3_qC3wEgQER2dY/edit?usp=sharing. I’m curious if anyone with the excel sheet can plug in my numbers and see if they also get this strange result.


    1. Michael Lustgarten Post author

      Hi Kovas, sorry about the delay-I respond to all messages on Patreon, if that interests you.

      Your data looks ok in the spreadsheet, the key is to not focus not just on the absolute age, but the age reduction, too, which is about 10y for this test.

      Liked by 1 person

  17. Vladimir

    Dear Michael, have you thought about why the model includes glucose but not insulin? Wouldn’t you agree that there can be two individuals with the same blood glucose level but the one that achieves it at the expense of a higher insulin level is in worse health. I think that HOMA-1 and HOMA-2 models should be standard tools for gauging glucose metabolism and yet we know many doctors do not request insulin tests, delaying the diagnosis of insulin resistance/T2D. A bit disappointed that the biological age model you shared in the spreadsheet also overlooks insulin and therefore, in my opinion, falls short of acknowledging that the relative (rather than absolute) glucose level is probably more insightful as a marker of health/age. Any thoughts on this from your perspective?


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  19. HIGO

    Your spreadsheet asks for Albumin in Units mg/dL, but I believe the test is typically g/dL. The spreadsheet works if you input a g/dL number, but fails if you use a g/dL number. Can you double-check that cell B6 has the correct units?

    Liked by 1 person

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