Why Some Believe 18-Year-Olds Should Not Be Considered Adults

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What Does Being an Adult Mean in Plain Words?

Being an adult means more than just turning 18 years old; it involves legal rights, responsibilities, and personal maturity. Legally, adults can vote, sign contracts, join the military, and be held accountable in court. However, adulthood also means managing finances, making thoughtful decisions, and living independently. For example, an adult typically pays their own bills and plans for the future. Many 18-year-olds gain these abilities gradually, often needing guidance and experience to handle them confidently. Recognizing that adulthood is not a single moment but a developmental process helps explain why some people feel 18 is an arbitrary legal marker that doesn’t always match a young person’s readiness.

How Does the Law Define Adulthood at 18?

In the United States, most states set 18 as the "age of majority," meaning a person legally becomes an adult and gains full control over their personal, financial, and legal decisions. This includes the right to vote, enter contracts, serve on juries, and be tried as an adult in court. For example, if an 18-year-old signs a lease, they are legally obligated to pay rent, unlike a minor who often needs a parent or guardian’s signature. However, laws vary for certain activities: the legal drinking age is 21 nationwide, and driving ages range from 16 to 18 by state. Some states allow 17-year-olds to be tried as adults for serious crimes, blurring the line between juvenile and adult status. This shows that legal adulthood is not always uniform or straightforward, and the law sometimes takes a nuanced approach based on the situation.

Why Do Some People Think 18-Year-Olds Aren’t Fully Adults?

Many experts studying brain science explain that the brain’s prefrontal cortex, responsible for reasoning, impulse control, and long-term planning, continues developing well into the mid-20s. Because of this, 18-year-olds may be more prone to risky choices or emotional decision-making than older adults. For example, an 18-year-old might impulsively agree to a contract without understanding the consequences or struggle to control emotions in stressful situations. Life experience also plays a role; some 18-year-olds have never lived independently or managed a budget, limiting their ability to function fully as adults. This scientific perspective motivates calls to reconsider the legal age of adulthood, suggesting a more flexible or graduated system could better match maturity levels.

What Are the Implications of Treating 18-Year-Olds as Adults?

When 18-year-olds are legally adults, they face full responsibility for their actions, both civil and criminal. This means they can be held liable for contracts, debts, and legal disputes and can face adult criminal penalties. For example, an 18-year-old convicted of a crime may serve time in an adult prison, which has different risks and consequences than juvenile detention. Financially, they are accountable for debts and credit card bills. However, some young adults may not be ready for these responsibilities, leading to negative outcomes such as financial hardship or legal complications. Families, educators, and policymakers must weigh these risks against the benefits of granting full adult rights, finding ways to support young people during this crucial transition.

How Do People Confuse Legal Adulthood with Other Related Terms?

There is often confusion between legal adulthood and related concepts like emancipation, maturity, and juvenile versus adult court. Emancipation is a legal process where a minor under 18 gains adult rights early, often through court order, enabling them to make decisions like signing contracts or living independently. Maturity refers to emotional and cognitive readiness, which varies individually and is not legally defined. Juvenile versus adult court status affects how offenders are tried and sentenced; some 17-year-olds can be tried as adults for serious offenses even though they are not legally adults. The distinction between civil adulthood (legal rights) and criminal adulthood (court treatment) also varies by state. Here is a summary table clarifying these terms:

Understanding these distinctions helps clarify why legal adulthood at 18 is a legal milestone but not a comprehensive measure of maturity.

What Can Families and Educators Do to Help 18-Year-Olds Transition?

Parents and educators play a key role in preparing young people for adulthood beyond legal definitions. Teaching practical skills like budgeting, time management, and understanding legal documents is crucial. For instance, parents can guide teens through reading a simple lease agreement or budgeting for groceries to build financial literacy. Schools can add classes on civic responsibilities, personal finance, and mental health. Families might gradually increase independence, such as letting teens handle small bills or make appointments, helping them learn through experience with support. Encouraging conversations about consequences and problem-solving builds confidence. Here is a list of actions families and educators can take:

• Practice reading and discussing contracts or agreements.
• Create mock budgets to track income and expenses.
• Role-play decision-making scenarios (e.g., handling peer pressure).
• Teach how to access legal and financial resources.
• Discuss emotional regulation techniques and stress management.
• Encourage volunteer or part-time work for real-world experience.

This hands-on approach helps bridge the gap between legal adulthood and actual readiness.

What Should 18-Year-Olds Do to Protect Themselves Legally and Financially?

As 18-year-olds gain legal rights and responsibilities, they should actively learn how to protect themselves. This means reading contracts carefully before signing, asking questions if terms are unclear, and understanding credit card or loan obligations. For example, before applying for a credit card, an 18-year-old should verify interest rates, fees, and payment requirements. Keeping track of bills and deadlines prevents financial trouble. It’s also important to understand health care options, such as how insurance works and when to schedule medical appointments independently. Young adults can seek help from resources like local legal aid offices, consumer protection agencies, or trusted adults. Here are specific steps young adults can take:

1. Read all documents thoroughly and don’t rush into decisions.
2. Keep organized records of contracts, bills, and important papers.
3. Build a budget to monitor income and expenses.
4. Learn about credit scores and responsible credit use.
5. Know where to find affordable legal or financial counseling.
6. Talk to trusted mentors or family members before major decisions.

These actions help young adults avoid common pitfalls and build a stable foundation for adulthood.

Frequently asked questions

Can 18-year-olds be tried as juveniles in court?

Generally, once a person turns 18, they are tried as adults, but some states allow exceptions for certain crimes or circumstances. Juvenile court rules differ by state, so it’s important to check local laws.

Is emotional maturity legally recognized at 18?

No, emotional or mental maturity is not a legal standard. The law uses age as a bright-line rule, but individual maturity levels vary widely beyond this legal cutoff.

What is emancipation, and who can apply for it?

Emancipation is a legal process where a minor gains adult rights before 18, usually through a court petition showing financial independence and maturity. It’s available to some minors but requires court approval.

How can educators help teens prepare for adult responsibilities?

Educators can include life skills education, such as financial literacy, civic rights, and health management, and foster critical thinking and decision-making skills.

What resources can young adults use to learn about their rights?

Websites like USA.gov, local legal aid services, and nonprofit organizations offer free information on legal rights, financial education, and accessing help.

Why is the legal drinking age higher than 18?

The legal drinking age is 21 nationwide due to laws aimed at reducing alcohol-related harm among young people. This shows that some adult rights are granted later than 18 based on health and safety concerns.