Because of Imminent War

Stella stared at Hendrick as another sigh heaved from his chest before he finally replied.

"I haven't decided who it would be, yet. But I have to get married soon," he said and Stella understood why he was so depressed.

She knew that day would come soon since Hendrick was already twenty-one. But it still caught her by surprise. They had just returned and surely, Hendrick also still had a lot of work to do.

Stella figured that people in that world tended to get married early due to the life expectancy being in the fifties. It was even earlier for women due to childbirth.

Stella had learned from her teachers that war often breaks out between Solis Nigellus and the neighboring kingdoms.

It was another reason why people married early. They needed to have children in case they perished in the war or else their household would be left without the next head and would be doomed. They have to ensure that their bloodline continues.