Background: In the last two decades, successful aging (SA) and positive psychology (PP), the two paradigms of health have received great attention. They originate from different approaches, theoretical background, and objectives. Although they share many characteristics, their association remains understudied. This article aims to empirically analyze their possible interrelation. Methods: In this cross-sectional study, 169 healthy, old adults completed several questionnaires to assess the central framework for successful aging and positive psychology. Participants were recruited from recreational centers for older adults. Results: Confirmatory factor analyses with a two-latent-factor structure (SA and PP) showed an adequate fit between them. A unidimensional solution is clearly supported, implying that PP and SA variables actually share the same latent factor. Latent profile analyses revealed that all SA and PP variables shared the same trend: three classes were identified which had variations on the level of the whole set of variables, without qualitative differences between SA and PP variables. Conclusions: This work provides evidence for the conceptual similarity between SA and PP approaches.

(1) Background: Bariatric surgery (BS) is highly effective for treating severe obesity in the long term. However, studies investigating predictors and personality profiles linked to BS success yield inconsistent results due to varying methodologies and limited research. This paper aims to identify personality profiles associated with BS success. (2) Method: The study involved 67 patients undergoing bariatric surgery, evaluated through clinical and personality measures. Weight loss was monitored at 6, 12, and 24 months post-surgery. Hierarchical case cluster analysis and iterative k-means cluster analysis identified distinct groups based on excess body mass index loss (%EBL) at these intervals. ANOVA was employed to compare personality profiles between groups. (3) Results: Average weight loss after 24 months was 67.2%. Two success profiles emerged: 46.5% showed very good success, achieving 90% EBL in 24 months, while 55% in the second cluster had less than 40% EBL throughout follow-up. The successful profile correlated with greater self-efficacy and improved emotional adjustment. (4) Conclusions: Successful BS outcomes were linked to personality traits promoting sustained weight loss post-surgery.