Question bout sims 2 cheats (real easy)?

uhm. i wana know if the cheat for the sims to nvr grow up is aging off nd also i w wonderin if there is a cheat for only aging off for 1 particular sim....nd also if anybody knows the cheat for more then 8 ppl in a household:)! thankyou so much!!!! nd u dont have to answer the whole thing..:)