Building on the understanding that a career is a dynamic concept, this article applies the idea that parliamentarians' legislative activities vary according to their career stage and age. This is partly a function of experience and partly a function of future career prospects. Using a new data set of the German Bundestag (2002-13) that pinpoints the age and career stage of MPs at the time of individual activities, namely, attending votes, posing parliamentary questions, and holding rapporteurships, we identify practical and normative challenges to MPs' legislative work: It takes time to learn the trade and as the desire for re-election dissipates, a last-period problem arises. MPs significantly reduce their activity levels toward the end of their legislative careers, indicating a clear loss of accountability toward their parties and their constituents.Parliamentarians want to perform well in order to get re-selected, re-elected, and promoted to higher positions. In this they are limited by institutional structures such as election systems and selection procedures, but also by their own career prospects, expertise, and individual talent. While we already have substantial knowledge of the impact of institutions on parliamentarians' performance such as voting, our knowledge is more limited with regard to how the individually variable resources of career prospects and expertise either constrain or enable parliamentarians. Investigating the role of career prospects and expertise and their impact on the behavior of parliamentarians furthers our understanding of what limits and what drives parliamentarians during their course of their parliamentary career paths. In this study, we compare legislative activities with professional employment where people begin careers, learn a trade, and become active and efficient workers over the course of those careers. Careers are the product of rational, individual calculations (Daniel 2015), and including career prospects in an analysis of MPs' legislative activity improves our understanding of legislators' accountability toward their party and voters.