What Can You Do at Age 20? Legal Rights and Restrictions in the U.S.

At 20, a person in the United States is legally an adult for most purposes—but not every age-based rule ends at 18. A 20-year-old can generally vote, sign contracts, make medical decisions, and live independently. Federal and state laws still restrict certain activities, especially buying alcohol or tobacco, and rules for firearms, cannabis, gambling, and driving can vary. Knowing which rights apply nationwide and which depend on location can help prevent costly misunderstandings.

What Legal Adulthood Means at Age 20

In most states, the age of majority is 18. That generally means a 20-year-old can make legal decisions without a parent or guardian, enter enforceable agreements, and be responsible for their own debts and legal obligations. A parent’s involvement may still be required for a specific transaction or service, but usually because of that business’s policy or a separate law—not because a 20-year-old is a minor.

Legal adulthood does not erase every age threshold. Some laws set a higher minimum age for particular activities, and state law may add restrictions. A person’s rights can also depend on other circumstances, such as a court order, a professional license, or a criminal conviction.

Voting, Jury Service, and Civic Rights

Voting in federal, state, and local elections

U.S. citizens who are at least 18 generally have the right to vote in federal, state, and local elections, subject to registration deadlines and state election rules. A 20-year-old can register and vote if eligible. Some states allow preregistration before age 18, but registration procedures, identification requirements, and deadlines differ.

Noncitizens generally cannot vote in federal elections. A small number of local jurisdictions permit noncitizens to vote in certain local elections, but these rules are limited and vary by location. Voters should check their state or local election office for current requirements and registration information.

Jury duty and public service

At 20, a person may be eligible for jury service. Federal jurors must be at least 18, U.S. citizens, and meet additional requirements under federal law. State jury eligibility rules are similar in many places, but details—including exemptions and qualification procedures—are set by state law. Receiving a jury summons requires following the instructions; ignoring it can lead to penalties.

A 20-year-old may also be eligible to run for some local offices or serve on boards, depending on state and local law. Higher offices have separate minimum-age requirements. For example, the U.S. Constitution requires members of the House of Representatives to be at least 25.

Contracts, Housing, and Financial Decisions

Signing contracts and renting a home

Because 20-year-olds are adults in most states, they can generally sign leases, service agreements, and other contracts. A signed lease can create enforceable duties to pay rent, follow the lease terms, and cover certain damages. Landlords may screen applicants using lawful criteria, such as income, rental history, and credit, and may ask for a co-signer if an applicant does not meet their requirements.

There is no general federal law requiring landlords to rent to every adult applicant. Federal fair housing law prohibits discrimination based on protected characteristics, while state and local laws may provide additional protections. Before signing, renters should review the full lease, fees, utility responsibilities, renewal terms, and rules for ending the agreement.

Opening accounts, borrowing, and credit

A 20-year-old can generally open a bank account, apply for a credit card, and seek a loan in their own name, subject to the financial institution’s requirements. Approval is not automatic: lenders can consider credit history, income, existing debts, and other permitted factors. A co-signer may help with qualification, but the co-signer can become responsible if the borrower does not pay.

Federal credit-card rules require applicants under 21 to show an ability to make payments independently or have a qualifying co-signer, with limited exceptions. This rule applies to 20-year-olds. Building credit through on-time payments and keeping balances manageable can help establish a record, but carrying a balance is not necessary to build credit.

Medical Decisions, Privacy, and Health Insurance

At 20, an adult generally has the right to consent to or refuse medical treatment, subject to exceptions under state law and emergency circumstances. A parent does not automatically have authority to make medical decisions for an adult child. A 20-year-old can choose to share medical information with a parent or another person, and can use a health care proxy or similar document to name someone to make decisions if they become unable to do so.

HIPAA generally limits when health care providers may disclose protected health information. It does not prevent a capable adult from authorizing disclosure, and it has exceptions—for example, certain disclosures may be permitted or required by law. A parent’s access to a health plan’s billing or insurance records does not necessarily give the parent access to a 20-year-old’s full medical record.

The Affordable Care Act generally allows a young adult to remain on a parent’s qualifying health insurance plan until turning 26, even if the adult is married, living independently, or not claimed as a tax dependent. That coverage rule does not make the parent the decision-maker for the adult’s medical care.

Alcohol, Tobacco, and Cannabis: Important Age-21 Rules

Alcohol

Federal law supports a minimum legal drinking age of 21, and all states set 21 as the minimum age for purchasing alcohol. At 20, a person generally cannot legally buy or publicly possess alcohol, although state laws include narrow exceptions that may involve private settings, religious practice, or a parent or guardian. The scope of any exception varies, so it should not be assumed to apply everywhere.

Alcohol rules also cover furnishing alcohol to people under 21, and drunk-driving laws apply regardless of drinking age. For drivers under 21, many states use zero-tolerance or very low blood-alcohol limits. A 20-year-old should check the applicable state law rather than relying on rules from another state.

Tobacco and nicotine products

Federal law makes it unlawful for retailers to sell tobacco products, including cigarettes, cigars, and e-cigarettes, to anyone under 21. At 20, a person cannot legally purchase these products from a retailer under federal law. State and local rules may impose additional restrictions, including limits on possession or use in particular settings.

Cannabis

Cannabis laws differ substantially. Many states permit adult-use cannabis for people 21 and older, while others allow medical cannabis under separate eligibility and registration rules. At 20, a person may qualify for a state medical program if they meet its conditions, but that does not make recreational use legal where the minimum age is 21.

Cannabis remains illegal under federal law, and state authorization does not override federal restrictions. Cannabis may also be prohibited on federal property. Driving while impaired is illegal, and transporting cannabis across state lines can raise federal and state legal issues.

Firearms, Gambling, and Other Age-Restricted Activities

Buying or possessing firearms

Federal age rules depend on the type of firearm and how it is purchased. A federally licensed firearms dealer generally cannot sell a handgun to someone under 21, while federal law generally permits dealer sales of rifles and shotguns to people 18 and older. Federal law also sets rules for transfers by private, unlicensed sellers, but state laws can be stricter and may impose higher age limits, permits, waiting periods, or other conditions.

Possession is not the same as purchase, and both are subject to restrictions. Federal law prohibits firearm possession by certain categories of people, including some people with qualifying felony convictions. State laws add further requirements. Anyone considering a purchase or transfer should check current federal, state, and local rules.

Casinos, lotteries, and sports betting

There is no single nationwide minimum age for every form of gambling. Casino entry and wagering may require a person to be 18 or 21, depending on the state, casino, and type of game. State lotteries also set their own minimum ages, commonly 18 or 21. Legal sports betting is regulated state by state and often requires bettors to be 21, though some jurisdictions set a lower minimum.

Online platforms must follow the laws that apply where a user is located. A person should check the official state regulator’s rules and the platform’s age requirements before placing a bet. Using another person’s account or misrepresenting age can violate platform terms and may create legal consequences.

Driving, Travel, and Employment

A 20-year-old with a valid license can generally drive subject to the same core traffic laws as other adult drivers. States may have special rules for drivers under 21, including restrictions related to alcohol, and insurance companies may set their own eligibility and pricing criteria. A driver should review state motor vehicle rules and insurance terms when moving or traveling.

Car rental companies often set their own minimum-age policies. Many rent to drivers under 25 but charge a young-driver fee, while some locations or vehicle categories impose additional restrictions. These are generally company policies rather than a universal legal rule that every 20-year-old is barred from renting a car.

Federal law generally allows people to work in nonhazardous jobs from age 18, so federal child-labor restrictions for minors usually do not apply to a 20-year-old. Employers must still comply with wage, safety, discrimination, and other employment laws. State law may provide additional protections or requirements.

Military Service and Selective Service

At 20, a person may be eligible to enlist in a branch of the U.S. Armed Forces if they meet that branch’s current age, education, medical, fitness, citizenship or residency, and other requirements. Minimum and maximum ages differ by branch and can change, so an interested applicant should confirm current standards with an official recruiter or service website.

Most male U.S. citizens and male immigrants living in the United States must register with the Selective Service between ages 18 and 25, with some exceptions. Registration is not the same as enlistment. Current requirements and exceptions should be verified through the Selective Service System, particularly for people whose immigration or residency status affects eligibility.

Marriage, Moving, and Family Independence

In most states, a 20-year-old can marry without parental consent because they are above the usual age of majority. Marriage-license requirements, waiting periods, identification documents, and rules about prior marriages vary by state and sometimes by county. A person should check the local clerk’s office before applying.

A 20-year-old can generally choose where to live and can move to another state, subject to lease obligations, court orders, and other legal duties. Moving may affect voter registration, taxes, vehicle registration, health coverage, and eligibility for state benefits. Many programs use residency rules that are separate from the general right to relocate.

How to Check the Rules That Apply

Age-based rights can change at state borders and sometimes between cities or counties. For a reliable answer, identify the exact activity and location, then check an official government source. Useful starting points include a state legislature or agency, a local election office, a state alcohol or cannabis regulator, and the relevant federal agency.

• For federal rules: consult agencies such as the U.S. Election Assistance Commission, the Consumer Financial Protection Bureau, the Department of Health and Human Services, or the Bureau of Alcohol, Tobacco, Firearms and Explosives.
• For state rules: use official state websites and confirm that the information is current.
• For a specific legal problem: contact a licensed attorney or a local legal aid organization; general information cannot replace advice about individual circumstances.

At 20, most everyday adult rights are already available, but the minimum age for alcohol, tobacco, and many recreational activities remains 21. Checking the relevant law before acting is especially important for firearms, cannabis, gambling, and activities governed by state or local rules.