These are processes must be implemented for a unaccompanied minor turkish airlines :
Turkish airlines enable children to board flights as unaccompanied children without the requirement for a parent or guardian if they are seven years old and have not turned 12 at the date of departure .The unaccompanied minor must be at the airport at least two hours prior to the scheduled departure time of the flight. Unaccompanied minors who are flying are given priority by the airline.
https://www.travomonk.com/minor-policy/turkish-airlines-unaccompanied-minor-policy/