1 It would depend upon how quickly he or she is able to complete Flight School, and get his or her Pilot's license.
2 He could very well be ready by the time he is 25. But seriously though, long plane flights have been known to kill older people from blood clots. I would wait as long as I could.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.