You have to hold down shift,ctrl,c to get the cheat box then you type in the box maxmotives and that should work! If it did not work your game might have a glitch in it or something!
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maxmotives
As far as I know, there is not a cheat that can make sims younger again. Sorry.
Just use the boolprop cheat in the neighborhood and go to your skills and just click and drag on them.
There is no such thing as a hair cheat. If you want more hairstyles or colors you have to download them.
No you can't...and there is NO cheat code for mearmaids.....only if u have Sims 2 for PC...