Sadly behind a paywall. However, I think Frailty is a good guide to overall health. It does allow some non-invasive cheap tests to be used as part of overall health monitoring.
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It is on research gate:
Prognostic accuracy of 70 individual frailty biomarkers in predicting mortality in the Canadian Longitudinal Study on Aging
It’s a comparison of the models. Nothing really useful for individuals.
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The model in the supplementary file would be useful.