Ages 18-21 – 1.1%
Ages 22-25 – 5.0%
Ages 26-30 – 12.9%
Ages 31-35 – 16.4%
Ages 36-40 – 18.3%
Ages 41-45 – 15.3%
Ages 46-50 – 11.7%
Ages 51-55 – 8.0%
Ages 56-60 – 5.4%
Ages 61-65 – 3.1%
Over 65 – 2.7%
The United States is the world’s leader in incarceration with 2.2 million people currently in the nation’s prisons and jails — a 500% increase over the last forty years. Changes in sentencing law and policy, not changes in crime rates, explain most of this increase. These trends have resulted in prison overcrowding and fiscal burdens on states to accommodate a rapidly expanding penal system, despite increasing evidence that large-scale incarceration is not an effective means of achieving public safety.
source:https://www.sentencingproject.org/wp-content/uploads/2016/01/Trends-in-US-Corrections.pdf