Yes, you read that right.
Ever played an historical game with fake players and been annoyed that players were being generated with era-inappropriate facial hair frequencies?
...just me?
Well anyway, I went and looked at the photos of every player in 1880, 1948, and 1979, tried to match their facial hair to what the game had, calculated frequencies, and then turned them into .txt files like the game's default beard frequency file. So not only can you now import the beard frequency files to adjust what facegen does, you now also know that you can import beard frequency files to adjust what facegen does!
beard_frequency_19th_century.txt
beard_frequency_golden_era.txt
beard_frequency_seventies.txt
The 19th century one features a lot of mustaches but few beards. The golden era is almost completely cleanshaven. The seventies sees a lot of thick mustaches, full beards, but still plenty of clean faces and a few fancier styles.