Age of Majority in Illinois: 18 Years Old

Legal Adulthood at 18

In Illinois, the age of majority is 18. At this age, individuals acquire full legal rights and responsibilities, including the ability to:

• Enter binding contracts
• Vote in elections
• Marry without parental consent
• Make independent medical decisions
• Sue or be sued in their own name
• Apply for credit independently

Exceptions and Nuances

• Alcohol and Cannabis: Minimum age remains 21.
• Emancipation: Minors 16+ can petition for early legal independence.
• Criminal Responsibility: Juveniles as young as 13 can be tried as adults for serious offenses.
• Child Support: May extend to 19 if the child is still in high school.

Why It Matters

Reaching majority affects lease agreements, financial aid, healthcare privacy (HIPAA), and parental access to records. Young adults should understand their new rights—and obligations—upon turning 18.