How do I slow down the time when playing ancient scenarios

[Istria 73]

So I was creating a scenario about Ancient Near East, and I want it to be realistic, however, each turn the time moves forward to 3-4 years, how do I slow it down to 1 month?

[Wersjon 283]

Go to:
steamapps\common\Age of Civilizations II\game
edit file "Ages.json"
in every age you can find: GAME_DAYS_PER_TURN: %value%