Adult Age in Florida: What You Can and Can’t Do at 18

The age of majority in Florida is 18. At that birthday, the law drops what it calls the “disability of nonage” and treats you as an adult for almost every purpose: signing contracts, voting, consenting to your own medical care, suing and being sued, and facing adult criminal penalties.¹ The two carve-outs written into the statute are the Florida Constitution and the state’s Beverage Law, which keeps the drinking age at 21. A few other activities also stay off-limits until 21 under separate laws.

What Changes the Day You Turn 18

Before 18, most contracts a minor signs are voidable. After 18, they are not. A lease, a car loan, a phone plan, or a credit card agreement carries the same legal weight for an 18-year-old as it does for a 40-year-old.¹ Default on any of them and the other party can sue, report to credit bureaus, and send the account to collections.

Your parents lose their automatic legal authority the same day. They can no longer sign for you, make decisions for you, or override choices you make about your money, your medical care, or where you live. The independence and the exposure arrive together.

Voting and Jury Duty

Any U.S. citizen who is at least 18 and a permanent Florida resident can vote once registered through the county supervisor of elections. Eligibility begins on your 18th birthday.

Jury service uses the same threshold. Florida Statutes 40.01 requires jurors to be 18 or older, U.S. citizens, and legal residents of the state and the county where they are summoned.² A Florida driver’s license or state ID is also required, or a separate affidavit if you have neither. Ignoring a summons can result in contempt of court.

Adult Criminal Consequences

An offense committed at 18 or older runs through adult court. That means adult sentencing exposure, including prison rather than juvenile detention, and a public criminal record that will not be handled the way a juvenile case might be. The bright line between the juvenile and adult systems is drawn at 18 for most young people.

Medical Decisions and Your Records

At 18 you gain full authority over your own healthcare. You can consent to treatment, refuse it, choose your doctors, and access your medical records without a parent’s involvement. You can also sign a living will, in front of two witnesses, that spells out your wishes about life-prolonging treatment if you develop a terminal condition or enter a persistent vegetative state.³ And you can designate a health care surrogate to make medical decisions if you cannot communicate them yourself.⁴

The piece that surprises families most: once you turn 18, your parents lose access to your medical records under federal HIPAA rules, even if you are still on their insurance. If you want them kept in the loop, you have to sign a HIPAA authorization. Without one, providers cannot share your information with them.

A similar shift happens with school records. Under the federal Family Educational Rights and Privacy Act, the parents’ right to review records, consent to their release, and request corrections transfers to the student at 18 or when the student enrolls in a postsecondary institution, whichever comes first.⁵ Parents who want continued access after that need the student’s written permission.

Marriage and Child Support

You can marry at 18 without anyone’s permission. A 17-year-old can marry only with written consent from a parent or legal guardian, and only if the other party to the marriage is no more than two years older.⁶ No one under 17 can marry in Florida under any circumstances.

Child support normally ends at 18, but Florida Statutes 743.07 allows a court to extend it in two situations: when the child has a mental or physical incapacity that began before turning 18, or when the child is between 18 and 19, still in high school, and reasonably expected to graduate before turning 19.¹ Support does not terminate automatically; the paying parent generally needs to file a motion to end or modify it.

What Still Requires 21

Being a legal adult in Florida does not unlock everything. A handful of activities stay closed until 21, and getting them wrong can bring criminal charges.

Alcohol

Florida Statutes 562.111 makes it illegal for anyone under 21 to possess alcoholic beverages.⁷ Florida does not recognize a parental-consent or religious-ceremony exception. The one narrow carve-out covers culinary and hospitality students who are at least 18, who may taste but not consume alcohol as part of an accredited college curriculum under instructor supervision.

Firearm Purchases

Since 2018, Florida Statutes 790.065 has made it a third-degree felony for a licensed dealer to sell or transfer any firearm to anyone under 21.⁸ The exceptions cover law enforcement officers, correctional officers, and active-duty military servicemembers. The rule came in through the Marjory Stoneman Douglas High School Public Safety Act after the Parkland shooting.

Tobacco and Nicotine

Federal law has required buyers of tobacco products, including e-cigarettes, to be at least 21 since December 2019. The rule applies to all retail sales, with no exceptions for parental consent.⁹

Gambling

Florida’s minimum gambling ages vary by venue. Card rooms, bingo, penny-ante games, and pari-mutuel wagering on horse and dog racing and jai alai are open at 18. Casino-style gambling at Seminole Tribe facilities generally requires 21.

Getting Adult Status Before 18

Florida allows a minor who is at least 16 to be emancipated through a court proceeding, but the minor cannot file the petition on their own. A parent, legal guardian, or guardian ad litem has to file it.¹⁰ The petition must describe the minor’s character, education, income, and plan for meeting basic needs like food, shelter, and medical care. If a parent files, the court appoints an attorney for the minor. Emancipation is granted only if the court finds it serves the minor’s best interest, and once granted, the order gives the minor the legal status of an 18-year-old for all purposes under Florida civil and criminal law.

Federal Obligations That Kick In at 18

Selective Service Registration

Federal law requires nearly all male U.S. citizens and male immigrants to register with the Selective Service System between 18 and 26.¹¹ Not registering can disqualify you from federal student aid, federal job training, federal employment, and, for immigrants, U.S. citizenship. Once you reach 26 without having registered, the window closes. Registration is set to become automatic in late 2026 under an amendment to the statute; until then, the obligation is on the individual.

Federal Income Taxes

Turning 18 does not create a tax filing obligation by itself. The requirement depends on income. For 2026, a single filer generally must file a federal return if gross income exceeds the standard deduction of $16,100, though the rules are stricter if a parent claims you as a dependent and depend on how much of your income is earned versus unearned. Filing can still be worthwhile below the threshold when federal taxes were withheld from a paycheck, since that is how you get the withholding back.

1
Online Sunshine. Florida Code 743 – Rights, Privileges, and Obligations of Persons 18 Years of Age or Older
2
Florida Senate. Florida Code 40.01 – Qualifications of Jurors
3
Online Sunshine. Florida Code 765.302 – Procedure for Making a Living Will; Notice to Physician
4
Florida Senate. Florida Code 765.202 – Designation of a Health Care Surrogate
5
Office of the Law Revision Counsel. 20 USC 1232g – Family Educational and Privacy Rights
6
Justia Law. Florida Code 741.04 – Issuance of Marriage License
7
Online Sunshine. Florida Code 562.111 – Possession of Alcoholic Beverages by Persons Under Age 21 Prohibited
8
Online Sunshine. Florida Code 790.065 – Sale and Delivery of Firearms
9
U.S. Food and Drug Administration. Tobacco 21
10
Florida Senate. Florida Code 743.015 – Disabilities of Nonage; Removal
11
Office of the Law Revision Counsel. 50 USC 3802 – Registration