Abstract: The technology described in this document can be embodied in a computer-implemented method that includes accessing, by one or more processors, data for a plurality of health-related parameters of an individual, and determining, by the one or more processors, a corresponding individual age-adjustment factor based on data for one or more of the plurality of health-related parameters. The age-adjustment factor computed for a given health-related parameter represents an estimated gain or loss in age as indicated by the data for the given health-related parameter. The method also includes combining, by the one or more processors, two or more of the individual age-adjustment factors to provide a combined age-adjustment factor, and determining, by the one or more processors, a physiological age of the individual based on the combined age-adjustment factor and a chronological age of the individual.