At What Age Can a Child Make Their Own Decisions?

A child gains the legal power to make their own decisions gradually, not on a single birthday. The short answer to the question of at what age a child can make their own decisions is that full adult authority arrives at the age of majority — 18 in most states, 19 in Alabama and Nebraska, and 21 in Mississippi — but specific rights unlock much earlier: online accounts at 13, a first job at 14, driving around 16, and a long list of adult powers at 18.¹

Below is what changes at each age, and where state law or the type of decision shifts the answer.

A Quick Age-by-Age Snapshot

Age 13: create accounts on most websites and apps.
Age 14: eligible for most non-agricultural jobs, with strict hour limits.
Age 15–16: learner’s permit for driving, depending on the state.
Age 16: intermediate driver’s license; possible withdrawal from school in some states; adult passport application with parental involvement; loosened work rules.
Age 17: military enlistment with parental consent.
Age 18: legal adulthood in most states — voting, contracts, jury duty, rifle purchases, unrestricted work, full medical consent.
Age 19: adulthood in Alabama and Nebraska; last year to be claimed as a non-student dependent.
Age 21: adulthood in Mississippi; handgun purchase from a licensed dealer; independent credit card without a cosigner in most cases; some custodial account transfers.

Age 13: Digital Life

Thirteen is the most consequential threshold in a child’s online life. The Children’s Online Privacy Protection Act defines a “child” as anyone under 13 and requires websites and apps to obtain verifiable parental consent before collecting personal information from those users.² That’s why almost every social platform, email service, and online game blocks users under 13.³

Once a child turns 13, they can generally create accounts and click through terms of service on their own. COPPA is a floor, though. Individual platforms set higher minimums when they choose, and several states have passed or proposed laws requiring parental consent for teenage social media use well past 13.

Ages 14 and 15: First Jobs and Early Healthcare Decisions

Federal law sets 14 as the minimum age for most non-agricultural work.⁴ Fourteen- and 15-year-olds may work only outside school hours, only in non-manufacturing and non-hazardous jobs, and only for limited daily and weekly totals. States often add stricter limits on top of the federal ones.

Healthcare is also where the law starts loosening around this age. Many states recognize the mature minor doctrine, which lets a minor who genuinely understands a proposed treatment consent to it without a parent. Age floors vary: some states start at 14 or 15, others leave the call to the treating physician. Statutes in most states also allow minors, sometimes as young as 12, to consent on their own to treatment for sexually transmitted infections, pregnancy-related care, substance abuse, and outpatient mental health services. When a minor lawfully consents to their own care, HIPAA generally stops treating the parent as the minor’s personal representative for that treatment, so providers are not required to share those records with a parent.⁵

In an actual emergency, age and consent step aside entirely. A hospital with an emergency department must screen and stabilize anyone who arrives, without waiting for a parent to sign forms.⁶

Age 16: Driving, School, and Bigger Job Options

Sixteen is where a lot of practical independence starts. Every state uses a graduated driver licensing system. Learner’s permits usually become available at 15 or 16 (a few states allow 14), an intermediate license with curfews and passenger limits typically opens at 16, and a fully unrestricted license comes at 17 or 18 once the teenager has logged enough supervised hours.

School attendance rules also change around this age. Compulsory attendance ends between 16 and 18 depending on the state. Where the cutoff is 16 or 17, leaving school before graduation is legally possible but rarely simple. Florida, for instance, requires a 16-year-old withdrawing from school to sign a formal declaration acknowledging that dropping out will likely reduce their earning potential, and a parent must sign it too. Other states require meetings with school officials, written parental consent, or both.

Federal work rules loosen sharply at 16. Sixteen- and 17-year-olds can work unlimited hours in any occupation the Department of Labor hasn’t declared hazardous.⁷ The hazardous list is long and covers things like power-driven machinery, mining and logging, explosives, and radioactive materials.⁸ Sixteen- and 17-year-olds can also apply for an adult passport, but the application still needs evidence that a parent or guardian is aware — a co-signature, a signed note, or paying the fee.⁹

Age 17: Military Enlistment

A 17-year-old can enlist in the armed forces with parental consent; without it, the minimum age is 18.¹⁰ Enlisting also functions as a form of automatic emancipation, so a 17-year-old who joins takes on adult legal status through that act itself.

Age 18: Legal Adulthood in Most States

In 47 states plus D.C., 18 is the age of majority. Turning 18 unlocks the rest of the adult catalog at once:

Voting, under the 26th Amendment.
Signing contracts that fully bind you. Before 18, most contracts a minor signs are voidable, meaning the minor can cancel them before or within a reasonable time after turning 18. The main exception is contracts for necessaries — food, clothing, shelter, medical care — which minors can be held to.
Serving on a federal jury.¹
Consenting to all of your own medical care.
Unrestricted work, including in occupations the Department of Labor lists as hazardous.⁴
Purchasing a rifle or shotgun from a licensed dealer.¹¹
Enlisting in the military without parental consent.¹⁰
Registering with the Selective Service System, which is required of men from 18 through 25.¹²

Reaching the age of majority also ends parents’ legal authority over the now-adult’s decisions and generally ends their obligation to support them. Child support orders can extend past 18 in many states if the child is still finishing high school, has a significant disability, or the parents previously agreed to extended support.

Age 19 and 21: The Outliers

Alabama and Nebraska set the age of majority at 19, and Mississippi at 21. In those states, everything tied specifically to majority — contract capacity, the end of parental authority, and the end of child support obligations — shifts to the higher age.

A few decisions are gated at 21 everywhere:

Handguns. Federal law bars licensed dealers from selling handguns to anyone under 21; the age for rifles and shotguns is 18. Some states add further restrictions.¹¹
Independent credit cards. Federal regulations require issuers to check whether applicants under 21 can make minimum payments on their own income, not household income they merely have access to. Most 18-year-olds without steady pay need a cosigner or authorized-user status on a parent’s card. At 21 the rules relax and issuers can count any income the applicant reasonably expects to access.¹³
Custodial account transfers. Accounts held under the Uniform Gifts to Minors Act or the Uniform Transfers to Minors Act pass to the beneficiary at a transfer age set by state law and the type of account, typically 18 or 21.

When a Child’s Voice Matters, Even Without the Final Say

In a custody case, a child’s preference is one factor courts weigh under the “best interests of the child” standard, alongside each parent’s stability, the child’s routine, and the relationship with each parent. How much weight it carries depends on the child’s age and maturity. A 15-year-old who can clearly explain their reasons will generally influence a judge more than a 7-year-old choosing the parent with the later bedtime. Judges also consider whether the preference reflects the child’s own thinking or a parent’s coaching. But a child never has the legal right to pick which parent to live with until they reach the age of majority.

Becoming an Adult Earlier: Emancipation and Marriage

Emancipation is a court order that ends the legal relationship between a minor and their parents before the age of majority. Parents lose authority and lose their support obligation; the minor takes on full responsibility for housing, finances, healthcare, and legal matters. Most states require the minor to be at least 14 to 16, to be living apart from parents, and to prove they can support themselves through documented, legal income. Government assistance doesn’t count. A judge decides whether emancipation genuinely serves the minor’s best interests.

Marriage and active-duty military service trigger emancipation automatically. Marriage before 18 is still legal in most states, though the trend is toward restricting it. The most common minimum with parental consent is 16, and some states also require a judge’s approval. Roughly 16 states plus the District of Columbia have banned marriage under 18 outright, and more than 30 states have tightened their marriage-age laws since 2016. Where child marriage is still permitted, the minor who marries generally gains most of the legal rights of an adult.

1
Office of the Law Revision Counsel. 28 USC 1865 – Qualifications for Jury Service
2
Office of the Law Revision Counsel. 15 USC 6501 – Definitions
3
Federal Trade Commission. Children’s Online Privacy Protection Rule (COPPA)
4
U.S. Department of Labor. Fact Sheet 43 – Child Labor Provisions of the Fair Labor Standards Act
5
U.S. Department of Health and Human Services. HIPAA Privacy Rule and Sharing Information Related to Mental Health
6
Office of the Law Revision Counsel. 42 USC 1395dd – Examination and Treatment for Emergency Medical Conditions and Women in Labor
7
U.S. Department of Labor. Fair Labor Standards Act Advisor – Hours Restrictions
8
eCFR. Part 570 Child Labor Regulations, Orders and Statements of Interpretation
9
U.S. Department of State. Apply for Your Passport as a 16-17 Year Old
10
Today’s Military. Eligibility Requirements
11
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
12
Selective Service System. Who Needs to Register
13
Consumer Financial Protection Bureau. Section 1026.51 Ability to Pay