Background: Stress can cause a significant impact on social and occupational participation to the extent that is significant clinically. This study thus aims to verify any correlation among self-reported mindfulness, perceived stress, and psychological well-being among individuals in intimacy versus isolation (19-40 years) and generativity versus stagnation (40-65 years) stage of Erick Erikson's classification of development. Objectives: (1) To measure psychological well-being, mindfulness, and perceived stress in people from the two developmental stages. (2) To study the correlation between psychological factors (the six dimensions of psychological well-being and mindfulness) with stress in each group. (3) To compare between these two developmental stages and the relationship between psychological factors and stress. Study Design: This is a cross-sectional study. Methods: Males and females belonging to intimacy versus isolation (19-40 years) and generativity versus stagnation (40-65 years) stage of Erick Erikson's classification of development were included in the study. Paper-based version of perceived stress scale, mindful attention awareness scale (MAAS), and Ryff's psychological well-being scale were administered. The scores of perceived stress scale, MAAS, and Ryff's psychological well-being were compared. Results: individuals belonging to the intimacy versus isolation stage showed higher scores on stress and lower scores on mindfulness as compared to individuals in generativity versus stagnation (40-65 years) stage of development. Conclusions: Individuals who are more mindful experience less stress. Thus, practicing mindfulness can help deal with stress. [ABSTRACT FROM AUTHOR]