Illinois Romeo and Juliet Law: Age of Consent, Close-in-Age Rules, and Penalties

Overview

Illinois is another state your comparison chart probably lists as “limited,” and another where that label is too pessimistic.

Illinois has a genuine close-in-age provision, and a meaningful one: under 720 ILCS 5/11-1.50, where the victim is at least 13 and under 17 and the other person is less than five years older, the offense is criminal sexual abuse — a Class A misdemeanor rather than a felony. Five years is a wide allowance, matched only by Hawaii and Maine, and misdemeanor treatment is a substantial reduction.

There's also a second, separate provision covering two minors: where the person committing the act is under 17 and the other person is at least 9 and under 17, the offense is likewise a Class A misdemeanor.

What Illinois pairs with that generosity is a position-of-trust provision that is unusually aggressive. Where the older person is 17 or over and holds a position of trust, authority, or supervision over a victim aged 13 to 17, the charge is criminal sexual assault — a Class 1 felony. No age gap saves it. This is the provision that catches young coaches, tutors, camp counselors, and teaching assistants, and it reaches seventeen-year-olds who are otherwise at the age of consent.

1. Does Illinois Have a Romeo and Juliet Law?

Yes, functionally, and more generously than most charts suggest. Under 720 ILCS 5/11-1.50, where the victim is at least 13 and under 17 and the other person is less than five years older, the offense is criminal sexual abuse — a Class A misdemeanor rather than a felony. Five years is a wide allowance, matched only by Hawaii and Maine, and dropping to misdemeanor treatment is a substantial reduction rather than a technical one. A second provision covers two minors: where the person committing the act is under 17 and the other person is at least 9 and under 17, the offense is likewise a Class A misdemeanor. What neither provision touches is the position-of-trust rule, which carries no gap allowance at all and is discussed below.

2. Age of Consent in Illinois

Seventeen — one of a minority of states using that figure rather than 16 or 18. But the number needs an immediate qualifier: Illinois extends protection to 18 where a position of trust, authority, or supervision exists. So a seventeen-year-old is generally capable of consenting in Illinois, except with respect to a category of people who happen to include many of the adults in that seventeen-year-old's daily life. Below 17, the structure runs roughly as follows. Under 13 is predatory criminal sexual assault of a child, 720 ILCS 5/11-1.40, where the accused is 17 or older — a Class X felony, the most serious classification below murder, with an extended sentencing range. For victims 13 to 16 with a gap of five years or more, the offense is aggravated criminal sexual abuse, a Class 2 felony. For victims 13 to 16 with a gap of less than five years, it is criminal sexual abuse, a Class A misdemeanor. Where both parties are under 17, criminal sexual abuse applies as a Class A misdemeanor. And any minor aged 13 to 17 with a person in a position of trust falls under criminal sexual assault, a Class 1 felony.

3. Close-in-Age Exception Explained

The boundary here runs the opposite direction from Hawaii's, and it is worth being precise. Illinois's misdemeanor provision applies where the person is less than five years older; the felony provision applies where the person is five years or more older. So four years and 364 days is less than five years and stays a misdemeanor, while exactly five years crosses into a Class 2 felony. A single day moves a case between a misdemeanor carrying up to 364 days in county jail and a Class 2 felony carrying three to seven years in the Illinois Department of Corrections, plus registration. Where a couple sits near that line, documentation of exact birth dates is not a formality.

4. Legal Age Gap Rules

The five-year rule governs only the 13-to-16 band, and it governs it in both directions: under five years is a Class A misdemeanor, five years or more is a Class 2 felony. Below 13 the allowance disappears entirely and predatory criminal sexual assault applies as a Class X felony. Above 16, the age-based offenses drop away — a seventeen-year-old is at the age of consent — unless a position of trust exists, in which case the gap becomes irrelevant and the charge is a Class 1 felony. A separate provision handles two minors: where the person committing the act is under 17 and the other is at least 9 and under 17, the offense is a Class A misdemeanor regardless of the distance between them.

Position of Trust: Where Illinois Is Harshest

This provision deserves emphasis because it inverts the expectations the five-year rule creates.

Under 720 ILCS 5/11-1.20, a person 17 or older who holds a position of trust, authority, or supervision in relation to a victim aged 13 to 17 commits criminal sexual assault — a Class 1 felony carrying four to fifteen years.

Note what's absent: any age-gap requirement, and any exception for victims at the age of consent. A nineteen-year-old first-year teacher's aide and a seventeen-year-old student are within it. So is a college-aged camp counselor and a seventeen-year-old camper.

Illinois construes the category broadly, covering institutional, coaching, tutoring, employment, religious, and household supervisory relationships. For anyone working with young people in Illinois, this — not the age of consent, and not the five-year rule — is the operative statute.

Mistake of Age

Illinois's treatment is narrow and offense-specific. Do not assume a reasonable belief about the other person's age operates as a general defense in Illinois. Where any such argument exists, it is built from evidence by counsel — not offered to an investigator during an interview.

Marriage

Illinois raised its minimum marriage age to 18, eliminating the parental-consent and judicial-approval routes that previously permitted marriage at younger ages. Spousal language appearing in older versions of these statutes therefore has little practical application to Illinois marriages.

5. What Is Not Protected?

The five-year rule reaches one band of cases and leaves several others untouched.

• Explicit images. Illinois child pornography provisions use 18 as the threshold. Illinois has enacted a narrow juvenile-focused provision addressing certain sexting situations between minors, but it does not extend general protection, and it disappears once one party turns 18. Two Illinois seventeen-year-olds — both at the age of consent — face exposure for producing or exchanging images that the physical-conduct rules would not touch.
• Force, threat, or incapacity. Criminal sexual assault also reaches conduct accomplished by force or where the victim is unable to consent, independent of age or gap.
• Position of trust. The Class 1 felony under 720 ILCS 5/11-1.20 carries no gap allowance and reaches victims under 18, including those at the age of consent.
• Conduct in another state. Illinois borders five states, all using different figures — Indiana, Iowa, Missouri, Kentucky, and Wisconsin. Wisconsin uses 18. Missouri uses 17 with a four-year provision for a narrower band. The governing law is that of the place where the conduct occurred, and the Chicago metropolitan area straddles the Indiana line. Using a phone or the internet to arrange a meeting can trigger 18 U.S.C. § 2422(b) and its ten-year mandatory minimum.

6. Examples

7. Possible Penalties

Illinois's range spans from a county-jail misdemeanor to its most serious non-murder classification, and which end a case lands on can turn on a single day of age difference or on whether a trust relationship is alleged. Class X is Illinois's most serious non-murder classification, carries mandatory imprisonment with no probation available, and for predatory criminal sexual assault the range extends well beyond the ordinary Class X term.

8. Sex Offender Registration Risk

Illinois registers under 730 ILCS 150, the Sex Offender Registration Act, with terms of ten years or lifetime depending on the offense and any sexually dangerous or sexually violent designation. Illinois is among the more restrictive states here. It has historically provided very limited routes off the registry for adults — there is no general petition mechanism comparable to those in Connecticut, Colorado, or Georgia. Illinois also imposes extensive residency, presence, and employment restrictions, including prohibitions on being present in or near school property and public parks, which reach considerably further than the residency-only restrictions common elsewhere. Illinois registration rules have been the subject of ongoing constitutional litigation, including challenges to the breadth of the presence restrictions. Because the landscape has shifted more than once, get current advice rather than relying on older summaries. The practical upshot: whether a case resolves as a misdemeanor or a felony frequently determines registration exposure, and in Illinois that consequence is unusually difficult to undo later.

Statutes of Limitation

Illinois has eliminated the limitation period for many felony sexual offenses involving minors and substantially extended others. Which rule applies depends on the offense and on when the conduct occurred. Treat this as a matter requiring current research.

9. Official Statute Sources

Primary Illinois statutes and official government resources cited in this guide. Look each citation up on your state legislature's official website for the current text:

• Illinois Compiled Statutes — Criminal sexual assault, including the position-of-trust provision
  720 ILCS 5/11-1.20
• Illinois Compiled Statutes — Predatory criminal sexual assault of a child
  720 ILCS 5/11-1.40
• Illinois Compiled Statutes — Criminal sexual abuse, including the close-in-age provisions
  720 ILCS 5/11-1.50
• Illinois Compiled Statutes — Aggravated criminal sexual abuse
  720 ILCS 5/11-1.60
• Illinois Compiled Statutes — Sex Offender Registration Act
  730 ILCS 150
• Illinois General Assembly — Official Illinois Compiled Statutes
  Illinois General Assembly
• U.S. Department of Justice — Citizen's Guide to U.S. Federal Law on the Sexual Abuse of Minors
  U.S. Dept. of Justice, Criminal Division

10. When to Talk to a Lawyer

Before speaking with police, school administrators, or DCFS investigators, including in conversations framed as informal. Illinois presents two distinct pressure points. The first is the five-year line, where precise arithmetic determines whether a case is a misdemeanor or a Class 2 felony. The second is whether a position of trust is alleged, which can convert what looks like a misdemeanor fact pattern into a Class 1 felony regardless of the ages involved. Because Illinois offers so little relief from registration after the fact, the charge negotiated at the outset carries unusual weight. Ask specifically about registration duration and about the presence and residency restrictions, not just about the sentence.