I hate that you have to be that young to become Astartes. It says that when finding new recruits their minds are tested and they are put through a bunch of rigorous tests but I really dont see how you can see how mentaly prepared you are at such a young age.
I know the knights of Caliban had lots a training all tehir life but they are teenagers. It just seems off to me and I cant put my finger on it, you know?
+MAY THE DARK GODS BLESS YOU WITH MANY TENTACLES+