In the context of family structure and demographic changes, elderly care and living arrangements have become challenging in many countries. In contrast to the West, a high level of coresidence between parents and adult children has long been sustained by the social norms underpinned by filial piety in Taiwan. However, the declining influence of traditional values gives rise to a need to address the changes in intergenerational coresidence over time. Given the age-period-cohort identification conundrum, there has been a lack of congruent and consistent results from previous research on intergenerational coresidence. To fill the gap, drawing on the longitudinal data from the Panel Study of Family Dynamics survey collected in 2000, 2002, 2004, 2006, 2008, 2010, 2012, 2014, and 2016, this study adopted the growth curve modeling approach to analyze the dynamics of intergenerational coresidence of respondents born between 1935 and 1963. The analysis result showed that, after controlling for the effects of the period, cohort, and other independent variables, there is a polynomial relationship between age effects and respondents' probabilities of co-residing with children. Moreover, the result revealed evident gender differences in age effects. While men's probability of co-residing with children declined as they aged, their female counterparts' coresidence probability exhibited a double U-shaped projection as it fell, rose, then fell again. The analysis also found that, after controlling for other variables, respondents of younger cohorts were less likely to co-reside with children, which became even more statistically significant after holding the birth year of the eldest child constant. This finding underscores the increasing significance of changes in values and attitudes as younger cohorts come onto the scene. Based on the research findings, this study suggests that the government should revise the familisation-based care policy and design a policy framework that renders the future super-aged society compatible with independent and autonomous living among the elderly.