Well, according to Sims Wiki, Darren Dreamer is actually still a Teen, not a YA like I thought. I wanted to use him for a Deca-Dynasty, and have him marry Darleen, but it would've been unofficial anyways, because I need my mods to keep the game going (ErrorTrap and Overwatch!). So, since this is unofficial anyways, would letting Darren age up early be okay?
I'm not trying to gain a full advantage, or anything like that, Darren Dreamer was one of my favorite Sims to play with in TS2, and I was itching to use him in a Deca-Dynasty, when I found out he was in Lucky Springs.