Testing the Reciprocal Relationship Between Social Networks and Purpose in Life Among Older Adults: Application of a Random Intercept Cross-Lagged Panel Model

Objectives: The purpose of this study is to examine if there are longitudinal reciprocal effects between social network size and purpose in life among older adults. Methods: Using data from the National Health and Aging Trends Study, the sample included 1485 male and 2058 female adults 65 years and older. We first computed t-tests to assess gender differences in social network size and purpose in life. In order to examine the reciprocal effects between social network size and purpose in life over four time points (2017, 2018, 2019, and 2020), a RI-CLPM (Model 1) was computed. In addition to the main model, two multiple group RI-CLPM analyses (Model 2 and 3) were computed to test the moderated gender effect on the relationship with models estimating unconstrained and constrained cross-lagged parameters. Results: The results of the t-tests denoted significant gender differences in social network size and purpose in life. The results indicated that Model 1 fit the data well. The carry-over effects of social networks and purpose in life and spill-over effect from wave 3 purpose in life on wave 4 social networks were significant. There were no significant differences between the constrained and unconstrained models testing for moderated gender effects. Discussion: The findings of the study highlight the significant carry-over effect of purpose in life and social network size over four years and the positive spill-over effect from purpose in life on social network size at the subsequent wave, which only appeared at the last time point.