In California, a child must be at least 12 years old before the juvenile court can take jurisdiction over them for breaking the law. That floor, which sets the age of criminal responsibility in California, was established by SB 439 and took effect on January 1, 2019. Below 12, the juvenile system is closed to the child except for a short list of the most serious violent offenses. Between 12 and 17, cases go to juvenile court by default, and only in limited circumstances can a case move to adult court.
The Minimum Age Is 12, With Narrow Exceptions
Welfare and Institutions Code Section 602 gives the juvenile court jurisdiction over any person between 12 and 17 who violates a state or federal law or a local criminal ordinance. Curfew ordinances that apply solely because of a minor’s age do not trigger that jurisdiction, even for someone in the 12-to-17 range.1California Legislative Information. California Welfare and Institutions Code 602 – Wards Jurisdiction
Before SB 439, California had no statutory minimum age at all. A child of any age could, in theory, be processed through the juvenile justice system. The 2019 law drew a hard line.
The exceptions for children under 12 are narrow and specific. The juvenile court can take jurisdiction over a child younger than 12 only when the alleged offense is murder, rape, sodomy, oral copulation, or sexual penetration committed through force or threats of bodily harm.2California Legislative Information. California Welfare and Institutions Code 602 (2025) Outside those five crimes, the court has no authority over a child under 12, no matter what the conduct looked like.
What Happens When a Child Under 12 Breaks the Law
If a child under 12 does something that would otherwise be a crime, and it isn’t one of the five listed offenses, the case never enters the court system. The response comes from families, schools, and county agencies rather than the probation department or a judge. Counties handle these situations through community-based organizations, behavioral health services, and the child welfare system.
In practice, a 10-year-old who steals or fights at school won’t face a courtroom. The response might be school discipline, family counseling, or a referral to a county mental health program. The legislature made a deliberate choice here: for most offenses, routing very young children through the justice system was found to do more harm than good.
Ages 12 to 17: Juvenile Court, Not Criminal Court
When a minor between 12 and 17 is accused of a crime, the case goes to juvenile court. The structure looks familiar from the outside, with hearings, judges, and attorneys, but the orientation is different. Juvenile court is built around rehabilitation and the young person’s welfare rather than punishment.3California Courts. Juvenile Justice Court Process
The vocabulary tracks that difference. A juvenile court judge doesn’t find a young person guilty or not guilty. The judge decides whether to sustain the petition, meaning the evidence proved the alleged offense. An adjudication in juvenile court is not a criminal conviction for any legal purpose, which matters later when the young person applies for jobs, college, or professional licenses.
A typical case moves through a detention hearing shortly after arrest, where the judge decides whether the minor stays in custody or goes home to a parent. If the case continues, an adjudication hearing functions like a trial, and a disposition hearing decides what happens next.
When a Minor Can Be Tried as an Adult
California allows the district attorney to ask a judge to move a juvenile case into adult criminal court, but the circumstances are limited and depend heavily on how old the person was when the offense occurred.
Ages 16 and 17
A prosecutor can move to transfer a 16- or 17-year-old accused of any felony. The judge then holds a transfer hearing and must find, by clear and convincing evidence, that the minor cannot be rehabilitated within the juvenile system’s jurisdiction before granting the request.4California Legislative Information. California Welfare and Institutions Code 707 – Juvenile Court Jurisdiction Transfer That is a high bar. The default is for the case to stay in juvenile court, and the prosecutor carries the burden of overcoming it.
Offenses Committed at 14 or 15
The rule here is narrower than many people assume. A person who committed a serious listed offense at 14 or 15 can only be considered for transfer to adult court if they were not caught before juvenile court jurisdiction ended.4California Legislative Information. California Welfare and Institutions Code 707 – Juvenile Court Jurisdiction Transfer This provision reaches people who committed serious crimes as young teenagers but weren’t identified or apprehended until they were adults. A current 14- or 15-year-old sitting in juvenile hall cannot be transferred to adult court under California law.
The Five Factors a Judge Weighs
At a transfer hearing, the judge must evaluate five criteria:
- Criminal sophistication, measured by the minor’s age, maturity, intellectual capacity, and emotional development at the time of the offense, along with any history of childhood trauma, foster care involvement, or influence from adults or peers.
- Potential for rehabilitation before the juvenile court’s jurisdiction ends, giving weight to the young person’s capacity to grow and change.
- Prior delinquent history, including the seriousness of past offenses and how family environment and childhood experiences may have shaped it.
- The success of prior rehabilitation efforts, including whether earlier services actually addressed the minor’s needs.
- The gravity of the current offense, including the minor’s actual behavior, mental state, degree of involvement, and the harm caused.
Together, these factors reflect a philosophy that transfer is a last resort, not a default response to serious charges.4California Legislative Information. California Welfare and Institutions Code 707 – Juvenile Court Jurisdiction Transfer A minor who is transferred faces adult penalties, including state prison, so judges work through each factor carefully.
Federal Limits on Juvenile Sentences
Even when a California case ends up in adult court, the U.S. Constitution places outer limits on how severely a juvenile offender can be sentenced. Two Supreme Court decisions do most of the work.
In Roper v. Simmons (2005), the Court held that executing anyone for a crime committed before age 18 violates the Eighth Amendment’s ban on cruel and unusual punishment.5Justia. Roper v. Simmons The death penalty is off the table for juvenile offenders regardless of the crime.
In Miller v. Alabama (2012), the Court held that no juvenile can face an automatic sentence of life in prison without the possibility of release.6Justia. Miller v. Alabama A sentencing court has to consider the offender’s youth and decide individually whether such a sentence is proportionate. The Court grounded that requirement in the recognition that children are constitutionally different from adults, pointing to immaturity, susceptibility to peer pressure, and the capacity to change.
Both rulings apply directly in California. Even a 16-year-old transferred to adult court and convicted of murder cannot receive a mandatory life-without-parole sentence. The judge has to conduct an individualized sentencing evaluation, and the young person’s age and development must factor into the decision.