The entire field of chemistry, most of mathematics, the majority of history, etc didn’t exist yet. Depending on the region anatomy and physiology could be illegal. We didn’t have to know traffic laws, the vast majority didn’t need to know how to read and write. There were probably like 20 animals and insects total that an average person had ever even heard of.

Phone numbers? Only 8, but I have friends who could recite the entire story of the TV show Big Bang Theory start to finish.

TBH if you told me your name and shook my hand I probably wouldn’t remember it tomorrow because I have other priorities on my mind. Finite memory allocation memes aside it’s more of an issue of what we consider important in a more complicated and ever changing world.