I don't want a 17 year old and 9 year old to get married.

And when I want to give the 17 year old a more accurate age (she's supposed to be like 23 or something idk why I made her 17) / break them up, you don't let me because "This Mii has a sweetheart and so cannot nave a birthday that would make him/her a grown-up." I should have broken them up when I still had the chance. I hate this a lot?????