When I was little it was a common belief held by the kids in my neighbourhood that dinosaurs had lived a mere 100 years ago.
One Christmas, my Brownie troop went to a local rest home to sing carols for the residents. It turns out the day we went was also one of the residents' 100th birthday. One of the Brownie leaders introduced her to me this woman and told me that it was her 100th birthday. I was gob smacked! I immediately asked her what it was like to live with dinosaurs.
A childhood belief about history

others believed things like this
- I used to believe that everyone lived until they were 100 and you dropped dead on your 100th birthday!— Natalie
- When I was little, I used to believe that everyone died on their 100th birthday.— Kristen
- I usd to believe that, all Americans were left handed and we all died when we reached our 100th birthday!— Greg Baron
- I used to believe,there was a little person inside my Dad's box Brownie camera.— Sandra R
- I believed you had to color all the dinosaurs in coloring books green because all the dinosaurs WERE green.— Betty
- When I was a child I used to believe that there were dinosaurs living in the mountains near where I live.— Teacher LM