What Makes Super-Aged Nations Happier? Exploring Critical Factors of Happiness Among Middle-Aged Men and Women in Japan.

This study aimed to examine multiple factors associated with happiness from the perspective of gender difference among a middle-aged Japanese population. A total of 865 participants (male = 344, female = 521) aged 40-64 years were divided into two groups (high and low) by their self-reported level of happiness. Logistic regression analysis by gender was carried out. In men, high levels of happiness were significantly correlated with living with spouse, occupation, enough sleep, leading a normal life, and regular checkups; while low levels of happiness were significantly correlated with smoking and having two or more diseases. In women, low levels of happiness were significantly correlated with caring for a family member. Our data suggested that the factors relevant to happiness levels might vary between men and women among middle-aged people in Japan. To increase the nation's level of happiness, the Japanese government must implement extended social services and policymaking, to alleviate caregivers' burdens, especially among Japanese women.