This chapter provides an alternative framework for thinking about the research on age and crime. It argues that, contrary to a popular view in the research literature that emphasizes differences, there is considerable commonality of findings on age and crime, regardless of the approach taken to its study. The chapter provides an overview of what is meant by the age–crime curve and distinguishes that from the age distribution of crime. Next, basic facts of the age-crime relationship are discussed, followed by explanations of that relationship. The chapter then discusses the issue of whether individual age–crime curves fit the aggregate pattern and, finally, provides an illustration of how varying assumptions of the age–crime curve affect aggregate patterns using simulations.