Most cadets of Asian airlines became B737 f/os at a relatively young age. I heard that some join their national airlines as cadets after their " O " levels at 16+ and get their CPL by 17 or 18. After some sim and line training, they are second officers on B734 by 18 and after passing their proficiency check at 1000 hours they acquire their B734 f/oship at 19!