Thank you for the translation.
* Deep breath * Why does almost every East Asian work give absurd marriageable age ranges! And make them even lower if the setting is European ambient?!
Aside from the absurdity of ignoring when people are reproductively able, and only providing one year?! — the Western World, especially Europe, is noted to have had later marriages than the rest of the world (as in, if you're not royalty, being married off at the age of fifteen was on the low/younger end, even in Antiquity, Romans aside). Christianity further pushed back the typical ages, with marriage typically taking place when the couple, or at least the bride, was in their late adolescence or early twenties (in the Renaissance, men married late in order to have stable enough income to support a family; women still married during their late adolescence due to the limitations of child-bearing age).
You read that right: child marriages, bride or groom, were the exception, not the rule.
(You can contrast that with Africa, India, Central Asia, or, to a lesser extent, East Asia — where people, especially women married/marry much younger typically. Parts of Africa even have a problem with having girls married off and attempting (willingly or not) to have children almost immediately after menarche, resulting in problems such as fistula or impaired subsequent fertility.)
It looks like they semi-fact check for East Asian settings but come up with pretty much the most awful and impractical ideas for European ones…
Sorry about the rant. This is yet another common error that has been getting to me.