Previous studies have examined the independent roles of positive age stereotypes (PAS) and negative age stereotypes (NAS) in successful aging. This study aimed to examine the joint effect of PAS and NAS on the well-being of Chinese older adults, and to further examine whether this effect was moderated by flexible goal adjustment (FGA). Using a cross-sectional design, 279 Chinese older adults (age range 6097years) completed measures related to age stereotypes, FGA, and well-being. The results showed that PAS interacted with NAS to predict well-being. In addition, the joint effect of PAS and NAS was moderated by FGA. Specially, for older adults with low FGA, NAS weakened the positive association between PAS and well-being; whereas, for older adults with high FGA, NAS could not influence the association between PAS and well-being. Tailored interventions to modify aging perceptions and to enhance coping flexibility competence might be helpful for promoting the well-being of older adults.