For example, a 14 year old can consent to sexual intercourse with a person as old as 17 years of age. Minimum Legal Age With Parental Consent Teenage boys and girls who are at least 16 years old, but are not yet 18 years old can get married in Utah with the consent of their parents or guardians. Contracts by Minors Minors are bound for contracts they make for necessaries, such as food, shelter, clothing, etc. Incapable of Consent No person under the age of 14 can legally consent to sex; they are incapable of consenting. At the age of 14, the minor can petition the court for a guardian to be appointed to sue or defend oneself.