I showed my step neice, who is about 10-11 years old some circulated 1973 $1 bills, some 1954 series $1, 2 and 5s and she thought they were totally worthless. She had never seen any of these types of bills and thought they were playmoney or fake money. I guess since they don't look like the current money we use, then they must be fake, right? LOL. It was hard to convince her it was real money. She also had a hard time believing that the U.S. and Canada had a $2 bill. Or that Canada had a $1000 bill.
Also about 3 months ago, I spent and circulated, bird series $2 bill at Canadian Tire. The girl just stared at the money, kept flipping it over in her hands for awhile, then said hold on. She left her cashier wicket and spoke to another girl in the next wicket, they both looked puzzled and shook their shoulders. Then she went and got an older manager and she asked him if this was legit, he said yup. But I could see she wasn't too sure even after he confirmed it was real. She said, oh, oooooh kayyyyyy, in a doubting manner. So after a couple of minutes later after first handing her the note, she finally accepted it. I thought that was so funny. Most of the girls that work at Canadian Tire or no more older than 20 I'd say. Most are just young teenagers.