I would say when they start having to change out in gym. There is nothing more tramatic then having hair legs infront of all your friends and the boys too. Not 100% but I think that is about 6 th grade which is 11 12 ish.
Well good luck hope that helps.
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.