When did 14-year-olds become preteens? Oh, when they were born and stayed preteens up until the day before their 13th birthday — at least according to everyone who isn’t a writer for Yahoo! Style:
I know that Yahoo! writers and editors are not good with numbers. They confuse millions and billions, think that digits and letters are the same thing, and just don’t get percentages. But you’d think they’d know that fourteen isn’t a preteen because teen is part of the word.