I was just a kid, maybe 8 or 9 years old; my parents felt that as long as a movie was not glorifying criminal behavior, I could see scary movies, as long as that was the reason for the R rating.
I actually saw Aliens before I saw Alien, and I remember seeing the Queen being sucked into space, and she was still alive.
I had no idea about timelines, or physics then, and I expected that alien Queen to come crashing down on earth, through my bedroom ceiling.
I stayed up for like two nights just staring at the ceiling.
I saw the original alien shortly after, and that one scared me a lot too. The first Alien did not scare me as much as the Queen, she really got to me, but the original was a very close second.
Alien3 when that came out, I must have been in 6th grade by that time, so I was a little desensitized then, but it still frightened me, this time instead of expecting a giant Queen to fall from the ceiling I had half expected the A3 creature to come running into my room on the floor at 80 miles per hour.
Ohhh, and from about 3rd-6th grade, every time I got the stomach flu at night, I half expected to have a chest burster chew its way out of me.
I was terrified.
They honestly gave me nightmares.
It was Great.
I miss being that scared by a monster movie.