#1: Go to Options.
#2: Un-check the Enable Aging button.
Or if you just wanna make their lives last longer, you can just slide up the Sim Lifespan Bar to Epic. That way they'll live for 960 days.
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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. :)