I don't think I never didn't know at least as long as I've been able to remember that is ve always known I'm gonna die one day it's why I try to live as much as I can while I can.
I was in the 4th grade and I read a magazine saying that the world was gonna end...I looked out the window at school the whole time creeped out!!! Probably younger than that but I don't recall those accounts!!!
Blessings to all and,
May all be well with you ^_^