My Bortz Age: 19.49 years

Result at a glance

The basis is my blood panel from 19 September 2025. My chronological age at that point was 34.57 years. 21 of the 25 biomarkers in the Bortz model produce an estimated Bortz Age of 19.49 years.

Chronological age

34.57 years

Bortz Age

19.49 years

Biological Age Acceleration (BAA)

−15.08 years

Markers used

21 of 25

That works out to roughly 15 years and 1 month below my chronological age. This is a model-based estimate – not a diagnosis, not proof of actual physical condition and no guarantee of a longer life expectancy.

The blood values I used

All values come from a single lab appointment on 19 September 2025 and are given in the unit the model calculates with.

• Albumin

  46.00 g/L

  Contribution: −0.10 years

• Alkaline phosphatase

  92.00 U/L

  Contribution: +0.15 years

• Urea

  4.70 mmol/L

  Contribution: +0.19 years

• Total cholesterol

  5.39 mmol/L

  Contribution: +0.18 years

• Creatinine

  87.00 µmol/L

  Contribution: −1.69 years

• Cystatin C

  0.87 mg/L

  Contribution: −0.58 years

• HbA1c

  27.85 mmol/mol

  Contribution: −1.38 years

• CRP / hs-CRP

  0.60 mg/L

  Contribution: −0.64 years

• Gamma-GT

  23.00 U/L

  Contribution: −0.65 years

• Red blood cells

  5.69 ×10¹²/L

  Contribution: −2.43 years

• MCV

  84.00 fL

  Contribution: −1.36 years

• RDW-CV

  11.20 %

  Contribution: −4.51 years

• Monocytes

  0.43 ×10⁹/L

  Contribution: −0.17 years

• Neutrophils

  2.00 ×10⁹/L

  Contribution: −1.46 years

• Lymphocytes

  42.00 %

  Contribution: −1.45 years

• ALT / GPT

  30.00 U/L

  Contribution: −1.01 years

• SHBG

  46.50 nmol/L

  Contribution: +0.06 years

• Vitamin D 25(OH)D

  108.33 nmol/L

  Contribution: −2.87 years

• Glucose

  5.30 mmol/L

  Contribution: +0.11 years

• MCH

  28.80 pg

  Contribution: −0.83 years

• ApoA1

  1.61 g/L

  Contribution: −0.16 years

How each biomarker acts

In the model each biomarker acts through a fixed coefficient and its deviation from the cohort mean. A negative contribution lowers the estimate, a positive one raises it. On top of that the BAA contains an age-calibration term of +5.51 years that follows from chronological age itself. Contributions and age calibration together add up to exactly the BAA of −15.08 years.

A contribution that lowers the number is explicitly not a health recommendation: some coefficients in the model run counter to clinical intuition, and individual lab values cannot be judged in isolation as “better” or “worse”.

Which values were missing

Four specialist markers were not part of my lab report:

• High-light-scatter reticulocyte percentage (HLR %)
• Mean sphered cell volume (MSCV)
• Platelet distribution width (PDW %)
• Plateletcrit (PCT %)

For this example they were set to the respective model mean. Their mathematical contribution to the BAA is therefore exactly zero – 4 of 25 markers are neutrally imputed. Substitutes from related parameters are deliberately not used: hematocrit is not plateletcrit, MCV is not MSCV and RDW is not PDW.

This neutral mean imputation serves the practical example calculation. It does not correspond to the kNN imputation used in the original research project. The result should therefore be understood as an estimate, not as a clinically validated measurement.

Context and scientific limits

Benedikt was 34.57 years old at the time of measurement and therefore younger than the roughly 38 to 73 year old study cohort the model was developed on. The calculation is thus an extrapolation outside the age range that was investigated.

The result is a statistical estimate based on a linear model derived from UK Biobank data. It is not a diagnosis, not proof of actual physical condition and no guarantee of a longer life expectancy. Lab values fluctuate by day and by method; other labs, other units or a different sampling date can shift the result noticeably.

How this differs from my PhenoAge

From the same blood panel I also calculated my PhenoAge according to Levine. The fact that PhenoAge and Bortz Age point in a similar direction here does not make them the same measure. They use different biomarkers, coefficients and statistical models, so the results must not be equated directly.

Calculate your own Bortz Age

The calculator runs entirely in your browser. No blood values are stored, transmitted or written into the URL.

Blood panel date: 19 September 2025 (2025-09-19). Research-based estimate – not a medical diagnosis.