If you need to find a Sim to bring to your house so you can try to age them up, you can use the L&D to bring any Sim to the house. Then use another object like the cake like lisamwitt mentioned to age them up. You don't necessarily have to add Sims to a household to do things in TS2.
SnootySims did list all the cheats except those directly related to objects. But this link may help you in the future, if the link doesn't work click it a few times since it's being moved to the wayback machine (I hope) and may have to click a few times to get it to show up.
https://web.archive.org/web/20080125215301/http://www.snootysims.com/cheatsindex.php?id=cheats
