Article History
Received: 25 February 2026
Accepted: 20 July 2026
First Online: 24 July 2026
Declarations
Competing interests: The authors declare no competing interests.
Ethics approval and consent to participate: The China Health and Retirement Longitudinal Study (CHARLS) was approved by the Peking University Institutional Review Board (IRB00001052-11015). The English Longitudinal Study of Ageing (ELSA) was approved by the London Multicentre Research Ethics Committee (MREC/01/2/91). The Health and Retirement Study (HRS) was reviewed and approved by the University of Michigan Institutional Review Board. Informed consent was obtained from all participants in each of the original cohort studies.
Consent for publication: Not applicable.