An important question from research on criminal careers is whether the processes that generate participation in criminal activity are similar to those that drive offending frequency among those who have initiated. This article considers basic demographic correlates asking whether those factors are associated with both initial and sustained early adulthood criminality in Australia. Three findings emerged from the study: (1) the offenders exhibited high levels of criminal activity during early adulthood; (2) males were more likely than females to offend and offend at higher rates as adults; and (3) Indigenous youth were more likely than non-Indigenous youth to offend and offend at higher rates as adults. Overall, the study results showed that basic correlates of crime were linked to both participation and frequency of offending in early adulthood--even within a sample of serious offenders. The article addresses the theoretical implications of the findings and directions for future research.