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Levine’s Biological age calculator is embedded as an Excel file in this link from my website:

Quantifying Biological Age

Papers referenced in the video:
Inter- and intra-individual variability in daily resting heart rate and its associations with age, sex, sleep, BMI, and time of year: Retrospective, longitudinal cohort study of 92,457 adults
https://pubmed.ncbi.nlm.nih.gov/32023264/

Heart rate variability with photoplethysmography in 8 million individuals: a cross-sectional study
https://pubmed.ncbi.nlm.nih.gov/33328029/

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