I don't really play rotational anymore. I just make a new sim and mark the other unplayed.
I noticed in my game that when I played rotational, I never saw my other sims when my sim was out (I figured it was the different traits I used for each of them). I thought they were hibernating, LOL. Now I mark them unplayed so they go on with their lives and see what they are like when they age up.
You can leave them marked, and still choose to not age them up if they are marked as played. If unplayed, they will age unless you turn aging off for everyone.
Of course, some mods you might use can change it either way you play.