I like to play on normal - short (I think that's what they call it, the 50 day lifespan). I get bored easily, and I like the shorter lifespans because it helps move them along. That being said, I almost always end up aging up almost every age early, with the exception of young adult and adult. And, yes, that includes elder; "testingcheatsenabled true" + "Trigger Age Transition" = perfect way to get rid of an elder Sim that's getting boring, in a "natural" way. I also like to do this with the original generation of my legacy; have the founding member move in with his/her parents, then quickly kill them off, so that even my founder has some family history.