That's to be expected. For me the touchstone is more the 70s, as I turned 9 in 1970 & graduated high school & turned 18 in 1979, & even that's ancient history to a degree! Here's a different way of putting it into perspective; 1970 is almost 50 years ago now. In 1970, 1920 was 50 years ago, & how many people alive in the 70s that weren't alive in the 20s knew that much about that era? Granted they knew some things about it, but 50 years ago is a long time, no matter how you slice it.