I don't know what you mean by "cheat ageing," but if you go to options and gameplay, you can turn off ageing in the game. :)
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Go on your menu , then options, and press aging off.
If you don't want ANY sims to grow up, then theres a cheat. Heres the steps: Steps 1) Press ctrl,shift,c 2) a box will appear 3)type in that box aging off 4) This will make ALL your sims stop aging. Your welcome, Happy Simming!!
No, there is no cheat code for skills on The Sims 3.
On Sims 2: You can either feed your sims right or you can use the cheat Aging off. With that cheat your sims won't die because they won't grow up. If you are tierd of you sims and you want to make them grown ups or something else use the cheat Aging on. When you want to speed up that process: Go to the neigbourhood and use the cheat Bool Prop TestingCheatsEnabled true. Go too your family and press shift and click your sim. Then go too Set to Birthday. This doesn't work when you use Aging off. On Sims 3: There are no cheats, but you can go too your family and then options. Then you can set the duration of life high and/or put aging off there. Hope I helped!
There is no cheat for Mcdonalds in the Sims 2 or 3