<p>The objective of this study was to know the level of well-being, the route of access to well-being, the state of mental health and the self-perception of health that prevailed in older adults in Buenos Aires. Additionally, the relationships between the study variables were examined and the model that best predicted the self-perception of health in old age was investigated. The sample consisted of N = 634 subjects of both sexes between 65 and 100 years of age, who completed an ad-hoc socio-demographic questionnaire; the Mental Health Continuum- Short Form; the Scale of three routes of access to well-being and evaluated their self-perception of health. The results showed that psychological well-being, the flourishing mental health status, the route of access to well-being compromised life and positive self-perception of health predominated in the participants. Moreover, correlations between all the study variables were presented and it was found that the Mental Health Continuum predicted better, by a minimal difference compared to the Theory of authentic happiness, the variance of the self-perception of health in old age. This was the first study that analyzed and compared two contemporary models of well-being.</p>