Current knowledge about age with regard to crime has a solid foundation amassed with promising theory and research. There is certainty among social scientists about the existence of a relationship between crime and age; that the aggregate age of criminals peaks at late adolescence and early adulthood; and that this ‘age-crime curve’ exists in both aggregate and individual level data. Scholar perspectives vary on the nature of individual behavior within the curve, patterns, and determinants of criminal activity early in life; the trajectories represented by the aggregate curve; and desistance of criminal activity in middle age or late life.