before the Internet killed my attention span, I used to read a lot of science fiction and fantasy novels by a variety of authors. Since then, I’ve watched a lot of anime and read a lot of amateur writing. I don’t have specific sources to cite, but the trope is common enough and recurring enough that I stand by my claim of “generally accepted”.
In the USA probably because it’s their drinking age
I get the 21 , but I’m not clear about the 100.
before the Internet killed my attention span, I used to read a lot of science fiction and fantasy novels by a variety of authors. Since then, I’ve watched a lot of anime and read a lot of amateur writing. I don’t have specific sources to cite, but the trope is common enough and recurring enough that I stand by my claim of “generally accepted”.