In 2026, the international standard for the minimum age to hold a Commercial Pilot License (CPL) remains 18 years old. At this age, a pilot can legally be compensated for flying, though they are usually restricted to roles such as flight instruction, crop dusting, or banner towing. To fly for a major scheduled airline as a First Officer, the requirements are more stringent; in the United States, you must be at least 21 years old to obtain an Airline Transport Pilot (ATP) certificate, which is mandatory for Part 121 air carrier operations. Most cadet programs, like those offered by airlines such as IndiGo or Lufthansa, allow students to begin training at 17 so they can earn their CPL exactly on their 18th birthday. While you can start young, the career path requires hundreds of hours of flight time and rigorous medical and psychological evaluations before a pilot is entrusted with a multi-million dollar jet and hundreds of passengers.