TSA PreCheck rules state that if children in your group are 12 years old or younger, they can go through the expedited TSA PreCheck lane with you, even if they don’t have TSA PreCheck themselves. Travelers in your group who are ages 13 and older and not enrolled in PreCheck must go through the regular security line. And although not guaranteed, oftentimes when you book multiple tickets on one reservation and one of the travelers is a TSA PreCheck member, the status then applies to others on the reservation.