What is the minimum age of Transport Vehicle driver license?

Motor Vehicles Act, 1988. S. 4. Age limit in connection with driving of motor vehicles (1) No person under the age of eighteen years shall drive a motor vehicle in any public place: Provided that 1[a motor cycle with engine capacity not exceeding 50cc] may be driven in a public place by a person after attaining the age of sixteen years. (2) Subject to the provisions of section 18, no person under the age of twenty years shall drive a transport vehicle in any public place. (3) No learners licence or driving licence shall be issued to any person to drive a vehicle of the class to which he has made an application unless he is eligible to drive that class of vehicle under this section.