We ask whether patterns of racial/ethnic and socioeconomic stratification in educational attainment are amplified or attenuated when we take a longer view of educational careers. We propose a model of "staged advantage" to understand how educational inequalities evolve over the life course. Distinct from cumulative advantage, staged advantage asserts that inequalities in education ebb and flow over the life course as the population at risk of making each educational transition changes along with the constraints they confront in seeking more education. Results based on data from the 2014 follow-up of the sophomore cohort of High School and Beyond offer partial support for our hypotheses. The educational attainment process was far from over for our respondents as they aged through their 30s and 40s: more than six of ten continued their formal training during this period and four of ten earned an additional credential. Patterns of educational stratification at midlife became more pronounced in some ways, as women pulled further ahead of men in their educational attainments and parental education (but not income), and high school academic achievement continued to shape educational trajectories at the bachelor's degree level and beyond. However, African American respondents gained on White respondents during this life phase through continued formal (largely academic) training and slightly greater conditional probabilities of graduate or professional degree attainment; social background fails to predict earning an associate degree. These results, showing educational changes and transitions far into adulthood, have implications for our understanding of the complex role of education in stratification processes. [This paper was published in "Sociology of Education" (EJ1312922).]