Building on several recent papers that have brought the study of criminal career lengths back to the attention of criminologists, this study used a sample of serious offenders to examine the length of their official criminal career. This study not only examined overall career length, but it also examined the career length for five categories of offenses (serious, violent, serious violent, property, and drug), the residual career length as a function of age, and the correlates of the average career length. The data used consist of a random sample of 1,957 offenders released from the California Youth Authority in 1981-1982 who were followed into their 30s. The results of the study are interpreted in terms of their implications for theory, public policy, and future research needs. Appended are: (1) Categorization of Offense Types. (Contains 6 tables and 3 figures.)