1 km of living area: age differences in the association between neighborhood environment perception and self-rated health among Chinese people.

"Declarations Ethical approval and consent to participateAfter ethical approval, the Chinese General Social Survey (CGSS) launched in 2003, is the earliest national representative continuous survey project run by academic institution in China mainland. We used the public data of CGSS, no additional ethics approval was needed. Consent to publishNot applicable. Conflict of interestNone declared. Competing interestsThe authors declare no competing interests. Conflict of interest None declared. Competing interests The authors declare no competing interests."

"Funding This work was supported by the National Social Science Foundation Key Projects [grant number 21AZD073] and National Natural Science Foundation of China [grant number 71974194]."