In time they will age like you. If you want to make their lives go faster by automatically making them older, here is a cheat!
Step 1. Press CTRL+Shift+C
Step 2. Enter boolprop testingcheatsenabled true (Enter this in exactly as shown) in the typing area that has appeared at the top.
Step 3. Type in exit.
Step 4. While controlling the sim you want to make older, hold down the shift key and click on the mailbox of their home. Click "Set to birthday"
These steps only work for Sims 2. You can try them on a different Sims but I don't know if they are going to work.
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Get a high enough relationship with the Sim and make sure they're either both teens or both young adults or older.
no, the birthday cake is only used, to advance a Sim's age more quickly. If you want the Sim's birthday to happen before evening buy a cake, or if you have ageing in the options disabled, you can use a cake to make them older
You can make a Sim on Sims 2 younger by buying the elixir of life in the inventory, in the aspiration gifts, it adds a few days to their life, but only use it if your Sim has an aspiration level of gold or platinum.
unlike the computer version you can't change a sim once you've made him/her however you made them to start off as they change on their own as they get older and you have no control which sucks
in the sims 2, without hacks there are only two ways ways to end a pregnancy. you can either kill the sim, or you can use it cheats. The way to do it with the cheats is type in the boolprop cheat. shift click on sim and go to spawn. get the tombstone of l and d. click the tombstone and then click age transition. Your sim will grow older but your sim will not be pregnant. hope this helps.