Empirical treatments of agency have not caught up with theoretical explication; empirical projects almost always focus on concurrent beliefs about one's ability to act successfully without sufficiently attending to temporality. The authors suggest that understanding the modern life course necessitates a multidimensional understanding of subjective agency involving (a) perceived capacities and (b) perceived life chances, or expectations about what life holds in store. The authors also suggest that a proper understanding of agency's potential power within a life course necessitates moving beyond the domain-specific expectations more typical of past sociological work. Using the Youth Development Study, the authors employ a scale of general life expectations in adolescence to explore the potential influence of a general sense of optimistic life expectations in addition to the traditional approach on a range of important outcomes.