The main purposes of this study were to examine: 1) the relationship between human capital and aging preparedness; and 2) the moderating effect of social support on the relationship between human capital and aging preparedness of million birth cohort teachers in primary school affiliated with Sukhothai Primary Educational Service Area Office 1. The correlational research design and the cross-sectional study were employed. The partial least squares structural equation modeling technique was applied. The research results indicated that the human ...