The purpose of this study was to examine the predictive factors of the masters sports orientation in middle and older adults focused on their sport lifestyle. The longitudinal data on the National Survey on Active Aging 2008 and 2009 targeting on 50 and over were used (n=1,073). 24 variables on enjoyment of participating sport activities in both 2008 and 2009 surveys were categorized into 3 factors: health sports (to keep or improve their health), leisure sports (to play or travel), and masters sports (to compete or challenge), and each of them consists of 8 variables. These variables on enjoyment contained 1(strongly disagree) to 4 (strongly agree), thus scores of participation and intention in each 3 factors were calculated based on the responses of 2008 (Each score of 3 factors ranged from 8 to 32). Multiple regression analysis with all samples was conducted with masters sports score of 2009 survey as a dependent variable. As a result of the analysis, scores of masters sports participation and intention of 2008 significantly influenced to masters sports score of 2009. The same tendency appeared with each analysis of age groups (50s, 60s, and 70 over) and sex (male and female). It shows that middle and older adults have the intention to participate in sports activities with competitive mind through years.