Does it matter if the relationship was consensual?

No — consent is not a defense to statutory sexual assault under § 3122.1; the charge and its grading turn entirely on the ages of the parties and the calculated gap between them.

How is the age gap actually calculated?

It's based on the precise dates of birth of both people and the specific date the Commonwealth alleges the conduct occurred, which is why confirming those dates carefully matters as much as any other part of the case.

What happens if the age gap is close to the eleven-year line?

A gap that falls just short of or just over eleven years can move the grading between a felony of the second degree and a felony of the first degree, so that calculation deserves independent verification rather than accepting the Commonwealth's number.

Are corruption of minors and indecent assault charged along with this?

Frequently, yes — the same underlying facts often support additional counts under § 6301 or § 3126, and how those are resolved affects the overall sentencing and registration picture.

Is there ever a mistake-of-age defense?

Section 3102 allows a narrow mistake-of-age defense under limited circumstances; it doesn't apply broadly, but where the facts genuinely support it, it's worth evaluating.

Compare · Statutory Sexual Assault: Age Gap Grading Explained

The exact number of years between two birthdates can be the entire case.

Statutory sexual assault under § 3122.1 doesn't ask whether the younger person consented — consent is not a defense to the charge at all. What the statute asks is how old each person was and how far apart their ages were, because that gap is what determines both whether the charge applies and which of its two felony grades governs. A difference of four years or more but less than eleven is graded as a felony of the second degree; a difference of eleven years or more is graded as a felony of the first degree. Those thresholds sound simple, but in practice the actual calculation — using precise dates of birth and the specific date of the alleged conduct — can move a case from one grade to the other, and companion charges like corruption of minors or indecent assault are frequently filed alongside it. This comparison walks through what separates the two grades and why the underlying dates deserve the same scrutiny as any other element of the case.

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The short answer

Age difference of four years or more but less than eleven (F2)

This grade applies where the complainant was under 16 and the age gap between the two people, measured precisely, falls between four and just under eleven years. It's graded as a felony of the second degree, carrying a statutory maximum under § 1103. Because it sits below the eleven-year threshold, the exact birthdates and the date of the alleged conduct matter enormously — a gap that's a few months short of eleven years produces a materially different outcome than one that clears it. Sentencing guidelines, plea posture, and SORNA tier consequences under § 9799.14 are all affected by which side of that line the calculated gap falls on.

Age difference of eleven years or more (F1)

This grade applies to the same underlying statute where the calculated age gap reaches eleven years or more, and it's graded as a felony of the first degree, carrying the higher statutory maximum under § 1103. The higher grade generally reflects a longer registration term under § 9799.15 as well as more severe guideline exposure. As with the lower grade, consent is not a defense, and the case turns entirely on the ages of the parties and the date of the conduct at issue — not on any question of whether the encounter was consensual in the ordinary sense.

Age difference of four years or more but less than eleven (F2) vs. Age difference of eleven years or more (F1) — Pennsylvania comparison
What matters	Age difference of four years or more but less than eleven (F2)	Age difference of eleven years or more (F1)
Governing statute	§ 3122.1(a)(1)	§ 3122.1(a)(2)
Age gap threshold	Four years or more but less than eleven	Eleven years or more
Grading	Felony of the second degree	Felony of the first degree
Statutory maximum	Up to 10 years under § 1103	Up to 20 years under § 1103
Relevance of consent	Not a defense to the charge	Not a defense to the charge
Registration exposure	Tier assignment under § 9799.14, term under § 9799.15	Typically a higher tier or longer term under § 9799.14/9799.15
Common companion counts	Corruption of minors (§ 6301), indecent assault (§ 3126)	Corruption of minors (§ 6301), indecent assault (§ 3126)
Mistake-of-age relevance	Governed by § 3102, narrowly available	Governed by § 3102, narrowly available
What decides the grade	Precise dates of birth and date of the alleged conduct	Precise dates of birth and date of the alleged conduct

Scroll the table horizontally to compare every column. Statutory maximums are ceilings, not expected outcomes[1]. Nothing on this page is a prediction about a specific case.

Which one fits your case.

When the age gap is close to a threshold

A calculation that's off by even a few weeks can move a case between an F2 and an F1, or in some cases outside the statute altogether, so verifying both parties' exact dates of birth and the specific date the Commonwealth alleges for the conduct is one of the first things I check.

When mistake-of-age is raised

Section 3102 allows a narrow mistake-of-age defense in limited circumstances, and while it doesn't apply broadly, where the facts support it, it's worth evaluating carefully rather than dismissing outright.

When companion charges are stacked on

Corruption of minors and indecent assault charges frequently accompany a § 3122.1 count arising from the same conduct, and how those additional counts are resolved can affect both sentencing exposure and registration consequences beyond the statutory sexual assault charge itself.

When registration consequences drive strategy

Because the grade under § 3122.1 affects the registration tier and term under §§ 9799.14 and 9799.15, the age-gap calculation isn't just about sentence length — it can be the difference between a shorter registration period and a much longer one.

Frequently asked questions.

Common questions about statutory sexual assault: age gap grading explained in Pennsylvania.

No — consent is not a defense to statutory sexual assault under § 3122.1; the charge and its grading turn entirely on the ages of the parties and the calculated gap between them.
It's based on the precise dates of birth of both people and the specific date the Commonwealth alleges the conduct occurred, which is why confirming those dates carefully matters as much as any other part of the case.
A gap that falls just short of or just over eleven years can move the grading between a felony of the second degree and a felony of the first degree, so that calculation deserves independent verification rather than accepting the Commonwealth's number.
Frequently, yes — the same underlying facts often support additional counts under § 6301 or § 3126, and how those are resolved affects the overall sentencing and registration picture.
Section 3102 allows a narrow mistake-of-age defense under limited circumstances; it doesn't apply broadly, but where the facts genuinely support it, it's worth evaluating.

[1]18 Pa.C.S. § 3122.1 — Statutory sexual assault — graded F2 where the complainant is under 16 and the defendant is 4 or more but less than 11 years older, and F1 where the age difference is 11 years or more.
[2]18 Pa.C.S. § 3102 — Mistake as to age — where the complainant is alleged to be under 14, mistake of age is no defense; above that age, a defendant may prove a reasonable belief the complainant was above the critical age.
[3]18 Pa.C.S. § 3126 — Indecent assault — indecent contact without consent; graded from M2 up to F3 depending on the subsection, the complainant's age, and prior convictions.
[4]18 Pa.C.S. § 6301 — Corruption of minors — M1 for corrupting the morals of a minor under 18, and F3 under § 6301(a)(1)(ii) where the course of conduct would constitute a Chapter 31 offense.
[5]42 Pa.C.S. § 9799.14 — SORNA tier system — assigns registrable offenses to Tier I, Tier II, or Tier III, which is what sets the registration term and reporting frequency.
[6]42 Pa.C.S. § 9799.15 — SORNA period of registration — 15 years for Tier I, 25 years for Tier II, and lifetime for Tier III, with in-person reporting intervals set by tier.
[7]18 Pa.C.S. § 1103 — Sentences for felonies — F1 up to 20 years, F2 up to 10, F3 up to 7.

Statutes are summarized for public reference. Confirm current text at palegis.us. This page is attorney advertising, not legal advice.

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