Growing Up in Australia: The Longitudinal Study of Australian Children (LSAC) has now produced five waves of data, capturing information on young children growing up and now entering adolescence. This article explains the design and methodology of the study, and how it has enhanced our capacity to understand the lives of Australian children and their families. Now that the K cohort children are 12-13 years old, they are being asked new questions about this time of transition, such as conflict with authority and antisocial behaviour, after-school time use and supervision, and pocket money, an important aspect in the development of financial literacy