This study investigated the bidirectional association between physical and cognitive function in later life and examined the mechanisms underlying the interrelationship. We employed cross-lagged panel models to analyze a sample of 4232 unique participants aged 65 years and older from three waves of the Chinese Longitudinal Healthy Longevity Survey. Physical activity and social participation were tested as potential mediators between physical and cognitive function. Our findings revealed a reciprocal relationship between physical and cognitive function and a reciprocal relationship between physical and cognitive decline. Moreover, physical activity was confirmed to mediate the bidirectional association between physical and cognitive function, whereas social participation did not seem to be a mediator. A vicious cycle linking physical and cognitive decline may exist in Chinese older adults. However, leading a physically active lifestyle could be an effective intervention to slow physical and cognitive aging, thereby toning down the vicious cycle.

We used the 2016 Hong Kong Census data and the diagonal reference model to investigate the effects of partners' educational pairings on fertility in Hong Kong. Our findings suggest a negative relationship between couples' educational achievements and their fertility. Moreover, males' educational attainment is more consequential of whether having children or not and both males' and females' educational attainments are determinants of the number of children to raise. In addition, the more educated a wife is relative to her husband, the less likely the couple is to have children. Once these educationally hypogamous couples have at least one child, they tend to have fewer children than their homogamous counterparts. By contrast, couples with a relatively more educated male are more likely to have children and tend to rear more children than those in educationally homogamous marriages.

Using pooled data from the Chinese General Social Survey in 2010, 2012, 2013, and 2015, this study investigated the relationship between partners’ educational pairings and subjective well-being among Chinese. Diagonal mobility models were employed to avoid conflating the effect of each partner’s education and the effect of the difference in education between partners. The findings reveal that regarding the well-being consequences of partners’ educational pairings, the hypothesis of satisfaction with marrying up outweighs the hypothesis of educational homogamy advantages and the hypothesis of sex roles. Specifically, for both women and men, persons marrying up in education are more likely to feel happy than their educationally homogamous counterparts. Moreover, educational hypergamy confers more psychological benefits to women in high-income communities than those in low-income communities. In addition, the earnings difference between partners plays a part in men’s SWB. Husbands who earn less than their wives are more likely to be unhappy than those whose earnings are 1–1.5 times those of their wives, suggesting that sex-role norms are at work. Our study contributes to a deeper understanding of the well-being consequences of educational heterogamy.

Using nationally representative longitudinal data from three waves of the China Health and Retirement Longitudinal Study (CHARLS), we assessed whether social participation and mental health were channels through which internet use and episodic memory mutually influenced each other. Cross-lagged panel models with multiple mediators were employed for the mediation analysis. The results reveal that social participation and depressive symptoms were mechanisms underlying the internet-cognition interplay. Among men, an increased chance of contacting friends served as a pathway connecting internet use with better episodic memory. Conversely, men with better episodic memory were more likely to use the internet partially due to their higher chances of having contact with friends and engaging in group activities. Among women, engagement in group activities and depressive symptoms were two channels through which internet use and episodic memory positively influenced each other. Our findings provide practical implications for slowing cognitive aging and narrowing the digital divide.