The age of consent in Colorado is 17; however, there exists in the legislation close-in-age exceptions, which allow those aged 15 and 16 to engage in acts with those less than ten years older and those less than 15 to engage in acts with those less than four years older. However, a 17-year-old can not legally consent to a person that is in position of trust.
18-3-402(1) Any actor who knowingly inflicts sexual intrusion or sexual penetration on a victim commits sexual assault if: (d) At the time of the commission of the act, the victim is less than fifteen years of age and the actor is at least four years older than the victim and is not the spouse of the victim; or (e) At the time of the commission of the act, the victim is at least fifteen years of age but less than seventeen years of age and the actor is at least ten years older than the victim and is not the spouse of the victim;