I have a pet-peeve with people who act like you cannot know about things from other time periods.

If you have any older relative, or like to explore history, or watch any movie other than your birth time then you are bound to know about a lot of things. The following genuration can also know about 90's things, because unless they live on an alien planet they will see it brought up all the time. Anyone can know about anything. Older people know about cavemen, the 20's, etc. That doe not mean every single one was born in it, or had to be to inow about it. 🙄