Can young adults marry? Can they marry an adult sim?

@jpkarlsen I think @Giapa95 is referring to the sim panel (where you can see if two sims are engaged, or married, or soulmates, or bestfriends etc...). Their 2 sims (one Adult and one YAdult) are engaged (through neighborhood stories I assume, since they write that they didn't get them engaged). And when they decided to get them married, they couldn't. Only when they made the young adult sim pass in age, then they were able to get them married.