In most of the United States, a 16-year-old can legally consent to sexual activity, so the age of consent under 17 is a legal reality in 34 states. Six states draw the line at 17, and eleven draw it at 18. Which rule applies depends entirely on where the activity takes place, and several other factors can override the basic age rule even when someone is technically old enough.
Where 16 Is Not Enough
There is no single federal age of consent governing most sexual activity between people in the same state. Each state legislature sets its own threshold, and the result ranges from 16 to 18.
Six states set the age of consent at 17:
- Colorado
- Illinois
- Louisiana
- Missouri
- New York
- Texas
In these states, sexual activity with someone who has not yet turned 17 can result in criminal charges regardless of whether the younger person appeared willing.
Eleven states set the threshold at 18: Arizona, California, Delaware, Florida, Idaho, North Dakota, Oregon, Tennessee, Utah, Virginia, and Wisconsin. In those states, anyone under 18 is legally incapable of consenting to sexual activity, and the penalties for violations tend to be steep. Every other state uses 16.
Close-in-Age Exceptions
Roughly half of U.S. states have some version of what’s commonly called a “Romeo and Juliet” law. These provisions reduce or eliminate criminal liability when both people are close in age, recognizing that a consensual relationship between two teenagers is different from an adult targeting a child.
The permitted age gap varies but typically falls between two and five years. In a state allowing a four-year gap, an 18-year-old in a consensual relationship with a 15-year-old would fall within the exception. A 23-year-old in the same situation would not. The exception applies only when the activity is genuinely consensual, with no force, coercion, or authority imbalance involved.
Most states that offer these exceptions also set a floor. The younger person usually must be at least 14 or 15 for the exception to apply. A relationship involving someone younger than that floor gets no protection from the close-in-age rule, even if the age gap is small.
About half the country has no close-in-age exception at all, meaning the age of consent is a hard line regardless of how old the other person is. The difference between protection and a felony charge can come down to a single birthday or a single year in the age gap.
When Being Old Enough Still Is Not Enough
Clearing the age threshold does not automatically make sexual activity legal. The law recognizes situations where genuine, voluntary agreement is impossible even between people who are technically old enough.
Authority and Positions of Trust
Many states have laws that raise the effective age of consent when one person holds authority over the other. A teacher and student, coach and athlete, correctional officer and detainee, therapist and patient: in these relationships, the person in the subordinate role is often legally unable to consent regardless of age. A 17-year-old who is above the general age of consent in their state can still be the victim of a criminal offense if the other person is their teacher or coach. Charges in these cases often carry enhanced penalties because of the trust violation involved.
Incapacitation
A person who is incapacitated cannot consent. Incapacitation goes beyond being tipsy. It means someone is unable to understand what is happening, who they are with, or what they are agreeing to. Alcohol and drugs are the most common causes, but incapacitation also covers someone asleep, unconscious, or unable to comprehend the situation due to a cognitive or developmental disability. The legal test asks whether the person had the actual capacity to make a voluntary, informed decision at the time.
Believing Someone Was Older
In most states, it does not matter whether the older person genuinely believed the minor was old enough. Statutory rape is treated as a strict liability crime in the majority of jurisdictions, meaning the prosecution does not have to prove the defendant knew the victim’s age. Even a reasonable, good-faith belief that someone was of legal age provides no defense.
A handful of states break from this approach. Alaska, Indiana, Kentucky, and Minnesota have statutes that allow a mistake-of-age defense in at least some circumstances, typically requiring the defendant to prove by a preponderance of the evidence that they reasonably believed the younger person was above the age of consent. Federal law also allows this defense in limited situations: under 18 U.S.C. § 2243, a defendant charged with sexual abuse of a minor in federal jurisdiction can assert as a defense that they reasonably believed the other person was at least 16.
The overwhelming majority of states still treat age as a strict line. A fake ID, a verbal claim of age, or a convincing physical appearance will not hold up in most courtrooms.
Crossing State Lines
Because the age varies by state, state borders matter. Under 18 U.S.C. § 2423, transporting anyone under 18 across state lines with the intent that they engage in sexual activity that would be criminal under any applicable law carries a mandatory minimum of 10 years in prison and a maximum of life.
A sexual relationship that is legal in one state but not in a neighboring state can become a federal felony the moment the two people cross the border together. The legality on one side of the line does not travel with them.
What a Conviction Carries
Penalties for sexual activity with someone below the age of consent vary widely depending on the state, the age gap, and the specific circumstances. In many states the offense is a felony carrying years or decades in prison. It is not universally a felony. In California, a close-in-age violation where the older person is no more than three years older can be charged as a misdemeanor, and Louisiana treats certain narrow situations as misdemeanors as well. The greater the age difference between the parties, the more serious the charge.
Prison time is only the beginning. A conviction almost always triggers sex offender registration under the federal SORNA framework, which operates on a three-tier system ranging from 15 years of annual registration at the lowest tier to lifetime quarterly registration at the highest. Individual states may impose longer durations than the federal baseline.
Registered sex offenders face restrictions on where they can live, often barred from residing near schools or parks, what jobs they can hold, and in some cases whether they can use the internet or be near children. A conviction at 19 can shape someone’s housing options, career, and relationships into their 40s and beyond.
Mandatory Reporting
Every state requires certain professionals to report suspected child sexual abuse to authorities. Teachers, doctors, nurses, counselors, social workers, and law enforcement officers are among those typically designated as mandatory reporters. When a minor discloses sexual activity that falls below the age of consent, or when a professional has a reasonable basis to suspect it, they are legally obligated to file a report, regardless of whether the minor considers the relationship consensual.
For purposes of mandatory reporting, “child” typically means anyone under 18, even in states where the age of consent is 16 or 17. The reporting obligation and the age of consent operate on separate legal tracks. A relationship that is technically legal under age-of-consent laws can still trigger a mandatory report under child welfare laws if other factors are present. A teenager who confides in a school counselor about a sexual relationship with an older partner may not realize that the counselor has no choice but to report it.