You need to go to the options from edit town mode and go to the game options folder (option folder with the gears) and click the box beside enable aging so their is no check mark. =)
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Options -> Game Options Tab-> Toggle Aging
To turn aging off, go to the options menu and in one of the categories should be aging. Click on the option to disable aging. This should work. If it doesn't, that would be strange.
Go on your menu , then options, and press aging off.
You can't reverse ageing, even with cheats, but you can turn aging off in the options screen, sorry man :(
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. :)