Purpose: This study was conducted to examine level of successful aging and factors influencing successful aging between elders attending senior citizen clubs and elders not attending these clubs. Methods: Participants were 126 elders who used senior citizen clubs and 136 elders who did not use these clubs. A survey method was used and data were collected using questionnaires and interviews. Results: Successful aging scores were higher in the group using senior citizen clubs. Scores for social support, aging attitude, and social participation, perceived health status, and satisfactory relationship with offspring were higher for elders in senior citizen clubs than for elders not in these clubs. Factors influencing successful aging in both groups were social support, aging attitude, depression, as well as satisfactory relationship with offspring, and social participation. These factors accounted for 65% of variance in successful aging. Factors influencing successful aging in elders who used senior citizen clubs were social support and aging attitude. Factors influencing successful aging in elders who did not use these clubs were social support, aging attitude, depression, and perceived health status. Conclusion: These results provide a basis for nursing intervention programs to increase the prevalence of successful aging in Korean older adults.