I liked the 1900–1920 ones best. There's no point in trying to pretend that the categories are scientific/natural or otherwise given. Might as well let people

I liked the 1900–1920 ones best. There's no point in trying to pretend that the categories are scientific/natural or otherwise given. Might as well let people just fill in whatever they self-identify as. Would probably yield more interesting and insightful results in the process.