6 decades books

2035 was one of the worst years in history, that''''s when the world went back to war again. Japan was one of the smaller fighters but wanted an ace up its sleeve. the government then promoted a program called the Pilot Division Program. A Program that uses Pilots to Pilot mechanized giants. But the problem is that the people capable of piloting these giants were only teenagers. How does this work out for Japan''''s war effort?