What's the gun law for open carrying in Tennessee and what age do you have to be?

Tennessee requires a permit to carry a firearm, whether openly or concealed. A license is required to carry a loaded handgun either openly or concealed. Such permits are issued through the Department of Safety to qualified residents 21 years. The length of the term for the initial license is determined by the age of the applicant. If renewed properly and on time, the license is renewed every 5 years.