Illinois Age of Consent: Five-Year Gap Rule and Penalties

The age of consent in Illinois is 17. Anyone 16 or younger cannot legally consent to sexual activity, and Illinois has no close-in-age or “Romeo and Juliet” exemption that removes criminal exposure for partners near the same age. What the state does instead is grade the offense based on the age gap between the parties, whether the older person holds a position of trust, and whether the conduct involved penetration. Depending on those factors, the same underlying situation can be a Class A misdemeanor or a Class 1 felony carrying up to 15 years in prison.

The Three Offenses That Cover Underage Sexual Activity

Illinois doesn’t use a single “statutory rape” charge. Three separate statutes cover sexual activity with someone under the age of consent, and which one applies depends on the specific facts.

Criminal sexual abuse under 720 ILCS 5/11-1.50 is the baseline. It covers sexual penetration or sexual conduct with someone aged 13 to 16 when the older person is less than five years older. It also covers sexual conduct between two minors when the younger is at least 9. Both scenarios are Class A misdemeanors.1Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.50 – Criminal Sexual Abuse

Aggravated criminal sexual abuse under 720 ILCS 5/11-1.60 applies when the older person is at least five years older than a victim aged 13 to 16, or when the victim is under 13 and the offender is 17 or older. This is a Class 2 felony.2Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.60 – Aggravated Criminal Sexual Abuse

Criminal sexual assault under 720 ILCS 5/11-1.20 is the most serious age-based charge. It applies when a person 17 or older commits sexual penetration with someone aged 13 to 17 while holding a position of trust, authority, or supervision over the victim, or when the offender is a family member and the victim is under 18. This is a Class 1 felony.3Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.20 – Criminal Sexual Assault

The distinction between “sexual conduct” and “sexual penetration” also matters within each statute. Penetration generally triggers harsher treatment than other forms of contact, particularly where a position of trust is involved.

The Five-Year Age Gap Rule

The age difference between the parties is the single biggest factor in how these cases are charged. When an older person engages in sexual activity with someone aged 13 to 16, Illinois draws a hard line at five years.

If the gap is less than five years, the offense is criminal sexual abuse, a Class A misdemeanor punishable by up to one year in jail and a fine of up to $2,500.4Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-55 – Class A Misdemeanors; Sentence

If the gap is five years or more, the offense is aggravated criminal sexual abuse, a Class 2 felony punishable by 3 to 7 years in prison.5Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-35 – Class 2 Felonies; Sentence

In concrete terms: a 19-year-old who has sexual contact with a 15-year-old faces a misdemeanor because the gap is four years. A 21-year-old in the same situation faces a felony because the gap is six. That one-category jump is the difference between a jail sentence of under a year and a prison term of three to seven years.

When Authority or Family Raises the Age to 18

Illinois effectively raises the age of consent to 18 when the older person holds a position of trust, authority, or supervision over the younger person. Teachers, coaches, counselors, and similar authority figures who commit sexual penetration with someone aged 13 to 17 face criminal sexual assault, a Class 1 felony carrying 4 to 15 years in prison.6Illinois General Assembly. Illinois Code 730 ILCS 5/5-4.5-30 – Class 1 Felonies; Sentence

The same Class 1 felony applies when the offender is a family member and the victim is under 18. In both situations the age gap between the parties is irrelevant. A 22-year-old teacher who has sexual penetration with a 17-year-old student faces the same charge as a 40-year-old coach in the same scenario, even though the 17-year-old could legally consent to sex with a non-authority figure.3Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.20 – Criminal Sexual Assault

Illinois Has No Romeo and Juliet Law

A common misconception is that Illinois protects teens in consensual close-in-age relationships. It does not. The close-in-age exemptions that exist in many other states are absent from Illinois law.

What Illinois offers instead is the reduced-severity provision described above: when the age gap is less than five years, the offense drops from a felony to a Class A misdemeanor. That matters at sentencing, but the conduct is still a crime. Even two 16-year-olds can technically face criminal sexual abuse charges, because the statute reaches sexual conduct by anyone under 17 with a partner aged 9 to 16. Prosecutors have discretion over whether to bring those cases, and charges between same-age teens are uncommon, but the legal exposure is real.1Illinois General Assembly. Illinois Code 720 ILCS 5/11-1.50 – Criminal Sexual Abuse

The trap most people don’t see: a 17-year-old dating a 15-year-old would be legal in many other states under a Romeo and Juliet exemption. In Illinois, that 17-year-old has technically committed criminal sexual abuse if the relationship becomes sexual. The charge is a misdemeanor because the gap is only two years, but a conviction still creates a criminal record.

Penalties by Offense Level

Sentencing tracks the offense class:

Sex Offender Registration

A conviction at the felony level almost always triggers mandatory sex offender registration under the Sex Offender Registration Act, 730 ILCS 150. People convicted of offenses such as aggravated criminal sexual abuse or criminal sexual assault must register with the law enforcement agency where they live, work, and attend school. The obligation runs for a minimum of 10 years for most offenses and can extend to a lifetime for more serious convictions or repeat offenders.7Justia. Illinois Code 730 ILCS 150 – Sex Offender Registration Act

Registration is not a passive formality. Registrants face restrictions on living near schools, parks, and other locations where children gather, and they must report changes in address and employment to law enforcement. Failure to comply is a separate felony. For many people the registration consequences prove more life-altering than the prison sentence itself, shaping employment, housing, and personal relationships for decades after release.

Mistake About Age Is Not a Defense

One of the most consequential features of Illinois age-of-consent law is what it doesn’t allow at trial. If you’re charged with criminal sexual abuse or criminal sexual assault based on the victim’s age, believing the victim was old enough is not a legal defense. It doesn’t matter that the minor had a fake ID, said they were 18, or looked older. These offenses are strict liability with respect to age. The prosecution only has to prove the victim was underage, not that the defendant knew.

This catches people off guard, particularly with dating apps where verifying a real age is difficult. From the law’s perspective, the burden falls entirely on the older person to confirm their partner’s age before any sexual contact. “I didn’t know” is not an argument the jury will hear on these charges.

Sexting and Images of Minors

Illinois treats sexually explicit images of anyone under 18 as child pornography under 720 ILCS 5/11-20.1, regardless of whether the minor consented or created the images themselves. Each individual image is a separate offense.8Illinois General Assembly. Illinois Code 720 ILCS 5/11-20.1 – Child Pornography

That has serious implications for teenagers who exchange explicit photos. A 16-year-old who sends a sexual image of themselves to a partner could face child pornography charges, and the recipient could face separate charges for possessing that image. The statute has no exception for minors sharing images with each other. Prosecutors don’t always bring these cases between teens, but nothing in the law prevents it.

Unlike the sexual abuse statutes, the child pornography law does allow one affirmative defense: if the defendant took affirmative steps to verify the person in the image was 18 or older and that reliance was reasonable, that can be raised at trial. The defense is narrow, and it applies to the pornography charge only, not to physical sexual offenses.

Civil Lawsuits Have No Time Limit

Beyond criminal prosecution, victims of childhood sexual abuse in Illinois can file civil lawsuits for damages. Illinois has eliminated the statute of limitations for civil claims based on childhood sexual abuse, so a victim can bring suit at any age regardless of how long ago the abuse occurred.9Illinois General Assembly. Illinois Code 735 ILCS 5/13-202.2 – Childhood Sexual Abuse

Civil cases use a lower burden of proof than criminal ones and can produce awards for economic losses like therapy costs and lost earnings, non-economic harm like pain and emotional distress, and in some cases punitive damages. A person acquitted in criminal court can still lose a civil suit over the same conduct, and someone never criminally charged can face financial liability decades later.