This. And maybe talk to your children before and after. My media intake was mostly unsupervised because my parents both worked shift, so I often couldn't talk through stuff.My son is 13.
He saw Aliens when he was 10 or 11.
It didn't fuck him up.
Be aware of your children's moods and sensitivities and they'll be fine.
I actually haven't watched Alien since I was a kid, and back then it was scary but exciting, especially since I could tell it was supposed to be a scary story just from the cinematography. I have definitely more mental scarring by watching Plague Dogs which was shown on a Sunday morning because look at the cartoon dogs! Look at them suffering through animal testing and being hunted down. Yay, they are going to drown trying to reach the island that's probably not even there. Or coming across Grave of the Fireflies on the French/German culture channel as a kid one evening. Oh, look! Anime! ... about a boy and a girl after the bombing of Tokio! Awww, the little girl is starving to death.
Wow - Amazon checks government ID card for age verification, that's kinda scary... Or is it a separate number for only that purpose?
It's not just Amazon, actually. Since 2007 cigarette vending machines have to control the age of the buyer either by your government ID, your drivers licence, or information from the chip card of your debit card.