Discussions about students in post-secondary education are often based on divisions of distinct subpopulations, which are in turn often based on demographics or generational status. In the context of adult learners who are also members of the Millennial generation, there exist no discussions of the overlaps between the two groups. In this chapter, the author provides an overview of the characteristics of both adult learners and members of the Millennial generation. Following a comparison of the characteristics of the two groups, the author offers a perspective of a distinct subpopulation: Adult Millennials. After offering strategies for working with Adult Millennials, with attention to online learning environments, the chapter concludes with suggestions for further research addressing Adult Millennials. Chapter published in Cross-Cultural Online Learning in Higher Education and Corporate Training, IGI Global Publishing