This study examines how online community activity influences social capital and the moderating effect of personal characteristic between them. Hierarchical regression and two-way ANOVA analysis were conducted with 9,479 samples. The results show that online community activity positively associated with off-line social capital, and it is observed that the effect in older people is stronger than younger people. This study extends previous perspective on the online community activity toward social capital and empirically proves that the activity have also an impact on off-line social capital. The moderating effect of age implies that activation plans of community for older people are required in order to increase social capital.