Final answer:
Crime appears to peak in the prime criminal age-cohort of 15-30 years old before declining with age.
Step-by-step explanation:
Crime appears to peak at what is known as the prime criminal age-cohort, which is between 15 and 30 years old. This is the age range when individuals are more likely to engage in criminal behavior. However, as populations age, the number of people in this age-cohort decreases, leading to a decline in crime rates with age.