Shut the entire fuck up.
its rape.
There's a reason for it too
In history, there's a very high mortality rate, so age is the least of the government's concerns. They want any women as early as possible to pop out kids. Otherwise, their nation will be wiped off the map.
Try be that guy saying "She's too young" in that age. They will think you are crazy instead.
Like as much as they give birth, humanity at the time still had High mortality (infant death ~30%, adult life expectancy ~30-40)
Basically, most people just die... That is, even if all the women in that world get preggo with all their eggs in their life.
Its still barely higher than the death rate.
So what will happen if you introduce this law to them?
Ah yes... All births will be delayed by 5-10 years... This is enough for many ancient armies to break the entire Nation Capital, burn the cities and r*pe all women...
Which is counterproductive, ain't it?
You make this law to save women just for them to be other nation's sl*ve...
And that's the current era this MC in... Medieval WAR state. The most chaotic part of any history.