In exercise psychology, few of studies are interested in physically old adults in French culture. The specific goals of the present research are: i) to test the factor structure for the three components: passion, subjective vitality and life satisfaction, and ii) to test a model that describes a mediator role of subjective vitality in the relationships between harmonious, obsessive passion and life satisfaction. Method two studies have been conducted. Data was collected from 790 physically active old adults (n = 567; n = 223). They practiced regularly their favorite physical activity more than 10 years old and aged between 55 and 72 years old. The Passion Scale (PS), Subjective Vitality Scale (SVS), and Satisfaction with Life Scale (SWLS) were administered on the participants. Results of the first study confirmed the factor structure and internal consistency for the three scales. However, 2 items have been deleted from the passion scale. The Goodness of Fit was acceptable in terms of χ2/df ratio, GFI, NFI, RMR, and RMSEA. Results of the second study confirmed the hypothesis; the mediator role of the subjective vitality of the effect of only harmonious passion on the life satisfaction has been confirmed. However, obsessive passion has no effect on the life satisfaction. Findings have been discussed.