I see, but if I remember correctly Master Samael wrote that those who practice maithuna do not age (mentally, as I understand) and have their hair color even at old age (in that paragraph he was talking about Native Americans, who have already died out). Samael wrote that old Native Americans (Indians) knew Arcanum A.Z.F. and that is why even the elders in their 90s had nice black hair (there wasn't gray hair at all).
I can't remember that book's title (but I'm 100% sure that it is written by Master Samael, as I don't read any esoteric books written by pseudo-esoterics), and I do remember reading this couple of years ago, also it seems legit. Maybe there are some rituals or this is a secret which you must find by yourself in the Astral?
Thank you for your time.
P.S. And well Samael Aun Weor's body died being 60 years old, so it is pretty old age. On average people start to have gray hair being 50 years old, and being 60 years old people usually have half of their head already gray. I have seen last photos of Samael Aun Weor of his last years and I was amazed that I could not see any single gray hair on his head. I guess he needed to be a good example for the devotees, as even such a small thing really motivates me.