This paper investigates the factors influencing changes in marriage following retirement in Taiwan. The data used are from the Survey of Health and Living Status of the Middle Aged Elderly in Taiwan. The Weibull models are used to estimate the hazard rates of divorce or separation after retirement. The factors of unobserved heterogeneity are also examined for the influences of divorce or separation after retirement. The main empirical results find that Mainlanders, Aboriginals, people with better educational attainments, people with poor health or poor relationship with family have higher hazard rates of divorce or separation than others. In contrast, people with more children and persons with higher income have lower hazard rates of divorce or separation than others. After considering unobserved heterogeneity, most estimated coefficients on the marriage hazard regressors are larger in magnitude than the corresponding coefficients in the reference model.