<p>In recent years, interest has grown in love life satisfaction. Empirical evidence shows that satisfaction with one’s love life favors subjective well-being, physical and mental health and marital quality and stability. In this sense, the study aimed to examine the evidence based on the internal structure validity, reliability and measurement invariance according to sex for the Peruvian version of the Satisfaction with Love Life Scale (SWLLS). Participants were 323 adults throughout the region of San Martin (Peru), with an average age of 68.73 years (SD = 7.17), where 49.5% were women and 50.5% men. The results provide evidence that supports the one-dimensional model (χ2 = 21.86, df = 5, p = 0.0006, CFI = 0.99, RMSEA = 0.102 [IC90% 0.061, 0.148]; and SRMR = 0.016) and adequate reliability (ω = 0.89 [95% CI; .83 -. 88]; <em>α</em> = 0.86 [95% CI 0.83 to 0.89]) of SWLLS. The multi-group analysis provided evidence of configural, metric and scale invariance across genders. The findings suggest that the Peruvian version of SWLLS is a tool with evidence of validity and reliability to measure love life satisfaction as well as being useful in studies comparing elderly Peruvians of both sexes.</p>