Age and Gender-Specific Dimensionality of the Satisfaction with Life Scale

Objectives: The Satisfaction With Life Scale (SWLS) generally operates as unidimensional but demonstrates invariance issues. This study aimed to examine the construct validity and stability of various SWLS across age and gender groups. Methods: Employing a convenience sample of community-dwelling European adults (N = 7531, median age = 26 (22-28) years, 51.1% females), this instrumental study investigated the structure and stability of SWLS through exploratory/confirmatory factor analysis (EFA/CFA) and multigroup CFA in SPSS and JASP. Results: EFA in 30% of the sample (n = 2246, KMO (0.86), Bartlett’s test of sphericity χ² (10) = 4561.84, p = 0.001) revealed a single factor with an eigenvalue of 3.12, which explained 62.35% of the variance. The unidimensional and two bidimensional structures (present/past life satisfaction; achievement/acceptance) expressed excellent fit (χ² (4-5) = 92.60-106.14, ps = 0.001; all CFIs = 0.994, ; TLI = 0.985-0.987, ; RMSEA = 0.052-0.056, ; SRMR = 0.013-0.014). Bifactor and second-order structures based on both two factor-structures did not converge. The three structures were invariant at the configural metric, scalar, and strict levels across age (<26, ≥26 years) while only the unidimensional SWLS was invariant at all levels across genders. Achievement/acceptance SWLS converged only in males while present/past life satisfaction converged only in females—the fit of both models was excellent, and the fit of the latter slightly improved when the errors of items 2 and 4 correlated. Conclusions: The findings support the use of the SWLS as a single-factor instrument for comparative purposes. SWLS components (cognitive or experiential) are interpreted uniformly among different age groups while gender-specific convergence patterns suggest meaningful gender-related nuances in its dimensional expression—males and females differently conceptualize SWLS components. Research should explore theoretical mechanisms underlying differential structuring of life satisfaction and examine whether these gender-specific dimensional patterns replicate across cultures and longitudinal designs.