Can a hemodynamic aging phenotype track the same person?

The study associates biological age trends with systemic hemodynamic parameters, including arterial pressure and cardiac index. Can this phenotype detect aging change within the same person, or is it calibrated mainly from differences between people? Repeated measurements would need to separate a persistent trajectory from short-term variation caused by measurement conditions or current physiology. A person-specific baseline could show whether movement in the hemodynamic signal consistently precedes movement in the biological age estimate. The stronger test would ask whether that change predicts a durable endpoint, such as later functional decline, beyond chronological age and baseline cardiovascular status. Without that temporal link, the phenotype may classify an aging state without establishing that it tracks aging progression.