Actually, she’s 15—almost 16—and they’re waiting for her to turn 16 for the marriage. So, between the time she meets him and the wedding, it’s actually like one or two months. She’s almost 16, so she even has her birthday before the wedding. So, she’s almost 16, and he’s 19.
The legal age for marriage in that world is 16 years old. That’s why the wedding happens after the birthday, and most young women marry at that age.

had to drop after like 10 chapters when they reveal she’s 14 and he’s 18, major ick