In Arizona, the age of majority is 18. On that birthday you become a legal adult under Arizona Revised Statutes Section 1-215, which defines both “adult” and “majority” as a person who has reached 18.1Arizona Legislature. Arizona Revised Statutes Title 1, Section 1-215 – Definitions Your parents or guardians lose their legal authority over you, juvenile court jurisdiction ends, and every right available to any other adult in the state belongs to you. A few important things still wait until 21, and a narrow set of circumstances can make you a legal adult earlier.
What You Can Do at 18
You can sign binding contracts in your own name. Leases, loans, bank accounts, and real estate purchases are all on the table. Before 18, most contracts a minor signs are voidable, meaning you can walk away. After 18, you’re bound by what you agree to, with narrow exceptions for things like fraud or duress.
You control your own medical care. Parents can no longer authorize procedures for you or access your treatment information. Under HIPAA, you become the sole person who controls access to your medical records, and if you want a parent to stay in the loop you need to sign a written authorization giving them access.2HHS.gov. Personal Representatives and Minors
Your education records become yours. Under the Family Educational Rights and Privacy Act, rights over school records transfer from your parents to you when you turn 18 or enroll in a postsecondary institution at any age. Your college cannot share grades, disciplinary records, or enrollment status with your parents without your written consent, unless your parents claim you as a tax dependent.3Protecting Student Privacy. Eligible Student
Federal labor restrictions fall away. Before 18 the Fair Labor Standards Act bars you from hazardous occupations such as mining, logging, roofing, and operating certain heavy machinery. At 18, those restrictions no longer apply.4eCFR. 29 CFR 570.120 – Eighteen-Year Minimum You can also vote, serve on a jury, and bring lawsuits in your own name.
What You’re Now Responsible For
Selective Service Registration
Almost all male U.S. citizens and male immigrants between 18 and 25 must register with the Selective Service System within 30 days of their 18th birthday.5Selective Service System. Who Needs to Register Failing to register is a felony carrying a fine of up to $250,000 and up to five years in prison. More commonly, it disqualifies you from federal student financial aid, most federal employment, federal job training programs, and U.S. citizenship if you’re an immigrant.6Selective Service System. Benefits and Penalties
Jury Duty
You become eligible for state and federal jury service at 18. Federal courts require jurors to be at least 18, a U.S. citizen, and a resident of the judicial district for at least one year.7United States Courts. Juror Qualifications, Exemptions and Excuses Ignoring a summons can bring fines or contempt of court.
Adult Criminal and Civil Liability
Offenses that would have gone through Arizona’s juvenile system now go through adult criminal court, where penalties are harsher and your record is public. Drug possession, theft, or assault can lead to felony charges carrying prison time, fines, and a permanent record that follows you into job and housing applications. Arizona’s sentencing statute sets specific prison ranges for different felony classes.8Arizona Legislature. Arizona Revised Statutes Title 13, Section 13-702 – Sentencing
On the civil side, you can be sued for damages. Arizona follows pure comparative negligence, so even partial fault for something like a car accident can leave you financially responsible for your share.9Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-2505 – Comparative Negligence A creditor with a judgment against you can garnish your wages under Arizona law.10Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-1598.10
What Still Waits Until 21
Eighteen does not unlock everything. Several activities require you to wait longer:
- Alcohol: you cannot legally purchase or consume alcohol until 21.
- Tobacco and vaping products: federal law raised the minimum purchase age to 21 in December 2019, and Arizona enforces the same threshold.
- Gambling: Arizona requires you to be 21 to participate in casino gaming, buy lottery tickets, or place pari-mutuel wagers.
- Handguns from licensed dealers: federal law sets the minimum age to buy a handgun from a federally licensed dealer at 21. Long guns are available at 18. Arizona does not add stricter state age requirements.
- Credit cards: under the Credit CARD Act of 2009, you cannot get a credit card before 21 unless you can show independent income sufficient to make payments or have a cosigner who is at least 21.11Federal Trade Commission. Credit Card Accountability Responsibility and Disclosure Act of 2009
The credit card rule catches many new adults by surprise. If you want to start building credit at 18, plan on either documenting enough income to cover payments or finding a willing cosigner.
Reaching Adult Status Before 18
Emancipation
Arizona allows minors who are at least 16 to petition a court for emancipation, which recognizes them as a legal adult for most purposes.12Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-2451 – Petition for Emancipation Order You file in the superior court of the county where you live and must show financial self-sufficiency and the capacity to manage your own affairs. Parents or guardians receive notice and can oppose, and the court weighs factors including your understanding of what emancipation means, your finances, your school performance, any criminal history, and your parents’ views, with the burden on you by clear and convincing evidence.13Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-2453 – Factors; Best Interests of Minor; Burden of Proof
A granted order gives you the ability to sign binding contracts, buy and sell real estate, establish your own legal residence, consent to your own medical care, enroll in school, apply for loans, and sue or be sued.14Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-2454 – Effect of Emancipation It ends your parents’ support obligations, their liability for your actions, and their right to your income. Emancipation does not override age-based restrictions like voting, alcohol, or tobacco.
Marriage
Arizona permits marriage at 16 or 17 under limited conditions. The minor must either have a court-ordered emancipation or the consent of a custodial parent or guardian, and the future spouse cannot be more than three years older than the minor. No one under 16 can marry in Arizona under any circumstances.15Arizona Legislature. Arizona Revised Statutes Title 25, Section 25-102 – Consent Required for Marriage of Minors
Things That Don’t Automatically Change at 18
Health Insurance Continues to 26
Turning 18 does not push you off a parent’s health plan. Under the Affordable Care Act, plans that offer dependent coverage must keep you eligible until you turn 26, whether or not you’re married, financially independent, in school, or living at home.16U.S. Department of Labor. Young Adults and the Affordable Care Act: Protecting Young Adults and Eliminating Burdens on Businesses and Families FAQs The privacy shift still happens, though. Your records belong to you, and providers cannot share treatment details with a parent without your HIPAA authorization. Explanation of benefits statements sent to the policyholder can reveal some claim information, so keep that in mind if privacy matters to you.
Tax Dependency Can Continue
Your parents can still claim you as a dependent after you turn 18. Under IRS rules, a parent can claim an 18-year-old as a qualifying child if the child is under 19 at year-end, lives with the parent more than half the year, doesn’t provide more than half of their own support, and doesn’t file a joint return (except to claim a refund). Full-time students qualify under this test until age 24.17Internal Revenue Service. Dependents This matters for FERPA, because colleges can share records with a parent who claims you as a tax dependent even without your consent.3Protecting Student Privacy. Eligible Student
Social Security Dependent Benefits
If you receive Social Security as a dependent child, such as survivor or disability benefits based on a parent’s record, payments generally stop at 18. Benefits continue until graduation or two months after your 19th birthday (whichever comes first) if you’re still a full-time student in elementary or secondary school, and childhood disability benefits can continue past 18 if your disability began before age 22.18Social Security Administration. Benefits for Children Contact the Social Security Administration before your birthday to confirm how your payments will be affected.
Where 18 Isn’t the Dividing Line
Minors Charged as Adults
Arizona does not always wait until 18 to treat a defendant as an adult. For serious violent offenses including first- and second-degree murder, armed robbery, and forcible sexual assault, the county attorney is required to charge 15-, 16-, and 17-year-olds as adults, with no judicial discretion for those specific crimes at those ages. For juveniles as young as 14, the county attorney has discretionary authority to bring adult charges for other serious felonies, including class 1 and 2 felonies and dangerous offenses.19Arizona Legislature. Arizona Revised Statutes Title 13, Section 13-501 – Persons Under Eighteen Years of Age; Felony Charging A juvenile convicted in adult court faces the same sentencing ranges and public record as any other adult defendant.
Guardianship for Adults Who Can’t Manage Their Affairs
Eighteen doesn’t always bring full autonomy. If an intellectual or developmental disability prevents a person from managing their own affairs, a court can appoint a legal guardian under A.R.S. 14-5304.20Arizona Legislature. Arizona Revised Statutes Title 14, Section 14-5304 The process involves medical evaluations and a court hearing to determine incapacity. Unlike parental authority, which ends automatically at 18, court-appointed guardianship continues indefinitely and can only be modified through a new court proceeding. Families in this situation should start the guardianship process before the child’s 18th birthday, because parental authority ends on that date regardless of the child’s capacity.
Childhood Legal Claims and the Clock That Starts at 18
Arizona pauses most filing deadlines while you’re a minor. Under A.R.S. 12-502, if a cause of action arises before you turn 18, that time doesn’t count against the statute of limitations. Once you turn 18, you get the same filing window any adult would have.21Arizona Legislature. Arizona Revised Statutes Title 12, Section 12-502 – Effect of Minority or Insanity If you were injured in an accident at 10 and the normal limit is two years, you have until age 20 to file. If something happened to you as a child that you never pursued, check whether your window is still open. The clock starts the day you turn 18.