Utah Code Ann. § 76-2-304.5
(1) It is not a defense to the following offenses that the actor mistakenly believed the victim to be 14 years old or older at the time of the alleged offense or was unaware of the victim's true age:
(2) It is not a defense to the following offenses that the actor mistakenly believed the victim to be 16 years old or older at the time of the alleged offense or was unaware of the victim's true age:
(3) It is not a defense to the following offenses that the actor mistakenly believed the victim to be 18 years old or older at the time of the alleged offense or was unaware of the victim's true age:
Amended by Chapter 247, 2026 General Session