By focusing on content analysis and keyword network analysis methods, this study aimed to analysis research trends in the field of adult learning and education for 512 papers published in ‘Andragogy Today’ from 2001 to 2020. According to the research, first, in terms of form of research, the most research utilizing content analysis is undertaken as independent research level and the most researchers are mainly based in universities. In terms of subjects of research, research on adult educational institutions and organizations were undertaken the most, and literature research method is mainly used. But at the same time, literature research method was became gradually decreased. Second, keywords that represented the largest frequency in keyword network analysis were “lifelong education/learning,” “adult education/learning,” “adult learners,” “HRD,” and “education for the elderly learning,” and compared to the goals and tasks of “lifelong education promotion plan,” keywords were changed at each time periods. According to the results of keywords network centrality analysis, it shows that keywords such as “lifelong education/learning,” “adult education/learning,” “adult learners,” “HRD” and “experience learning” etc. were the most dominated keywords of the network and have a strong influence in the field of adult education. Based on the above results, this study provided meaningful discussions and implications.