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Commencing in 1983, the longitudinal Australian Temperament Project (ATP) provides a valuable lens through which to view the pathways taken by Australian children from infancy to adulthood, and the factors associated with positive or problematic development. The study is now in its 25th year and has completed 14 data collection waves. This paper provides an overview of ATP findings on young people’s wellbeing at 23–24 years of age, their engagement in risk-taking behaviours such as alcohol use and risky driving, and the nature of parent–child relationships over adolescence and early adulthood.