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That would have been your reality if you were born a few hundred years ago. Humans didn't live long at that time the overall life expectancy is short. Hence people start getting married as early as 15 and they didn't mind about age gap that much. It's all about talent and things you could do back then
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People were engaged young, but they were married to their own age group though. Age gap as wide as this has been frowned upon too before that's why it wasn't normalized and abolished in todays age. But I understand what you're saying, still weird to me because I'm looking it with a modern eyes. I'll just convince myself that the MC is spiritually 33 yrs old, or the former King is actually younger and he just adopted his son - the King, or maybe there is another ML idk
I was surprised that she's 15 and marrying an old man with a son. I just convinced myself that MC was 18 in her past life... but at the same time, isn't that mean she's a pushover for sticking with the abuse of her family when she's literally 18yo+ at that time. Me personally if I have that OP powers I would just fuck it all and snuck out lmao