How old does a guinea pig have to be to breed?

You are asking the question the wrong way round. Female guinea pigs should not be older than 9 months as their pubic bones fuse making it difficult for them to give birth. Both mother and babies could die during the birth.

Please don't breed your guinea pigs as there are so many animals in shelters and rescues abandoned by their owners waiting for a loving home, if you breed more you will deprive them of a second chance for a happy life. More.

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.