1. Ma, C., Zheng, K.: Study on reemployment of retirees in second tier cities from the perspective of active aging - a case study of Hefei. Mod. Mark. (Bus. Ed.) 09, 18–19 (2020)
2. National Bureau of Statistics: Main data of the seventh census (2021). http://www.stats.gov.cn/ztjc/zdtjgz/zgrkpc/dqcrkpc/ggl/202105/t20210519_1817693.html. Accessed 12 May 2021
3. Wen, T.L., Zhang, M.Y.: Current situation and development strategies of home care services in Tianjin. Tianjin Econ. 09, 39–42 (2014)
4. Zhang, J.Q., Liu, H., Qi, Y.Q., et al.: Analysis of living environment and life satisfaction of the elderly in Beijing. Prog. Geogr. 34(12), 1628–1636 (2015)
5. Zhang, F., Li, D.: How the urban neighborhood environment influences the quality of life of Chinese community-dwelling older adults: an influence model of “NE-QoL.” Sustainability 11(20), 5739 (2019)