Hrm... that YA staying as YAs sounds like it might be Squingish. I think I saw a hack where he had YAs in the regular hood or something. You should probably look for that. Dunno if having sims stay as YAs would necessarily be harmful. ATM I can't think of anything specific that would cause things to blow up because of this, other than potential issues of sims staying forever as YAs, which would pretty much be as if you were playing with aging off.
The only problems I know that could arise is the possibility of sims having long lives and the amount of memories that they may accumulate, but since the number of iterations was boosted, this probably isn't as much of a concern anymore. I think Pescado said that it would take a long while anyways for sims to accumlate a bfbvfs inducing number of memories anyway. *shrugs*
The dead spouse thing was brought up again in another recent thread. Apparently, if the death happened before you had the post mortum hack installed, then the bug remains 'stuck' and must be manually fixed using SimPE (or I suppose you could probably use the Puppy
Killer to fix it.
* syberspunk hands Linda a pooper scooper to clean up her mess.
Ste