One of the characters in the book I'm reading says the following :
- »Aber Herrmann ist älter und viel größer als ich. Außerdem bin ich erst acht. Das ist nicht fair.«
The book is Magus, die Bruderschaft by Arno Strobel. (I'll get to the Zauberberg when my German's improved a bit more.) It was originally published in 2007. That particular bit of dialogue is set in 1970. Is fair an adjective that could have been used as early as that year? My feeling is no, but I'm not entirely sure.