The age category with the most robbery convictions for 1975 was the 18 year-old, with 27 convictions, and the 19 year-old, with a total of 20 convictions. The age categories not having any convictions in 1970 were the 22 and 25 year-olds. All of the age categories had one or more convictions in 1975. The 30 year-old had one conviction for the first six months of 1975. Social patterns show that as the population of each generation approaches age 30, the criminal rate is less evident, primarily because the habitual violator has been removed from society and the remaining numbers with criminal tendencies have developed marital and family ties and seek a more stable and less risky existence. A decrease in the population of Cincinnati did not result in a decrease in the number of robberies or robbery convictions. Statistics show this same pattern in many American cities. Even though national figures show an increase in police personnel from 1970-75, this did not impact crime to any noticeable extent. Cincinnati figures concurred with the national data. Limitations of the study and recommendations for further study are provided. Tabular data and a selected bibliography of 12 listings are provided. (Author summary modified)