I don't remember how young I was when I saw JP1, but I do remember being 6 when I saw Alien for the first time (my parents has never seen it and didn't think it was going to be that scary).
Needless to say, my older sister at the time 7 was scared shitless and so my mom and her left the room and me and my dad watched it (my mom didn't want me to stay and watch it but I begged and dad kind of saved me). I had nightmares from it, but didn't change the fact that I loved it. I've always loved horror films.