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.
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Yes, when you use the aging off cheat the entire family's aging will be turned off.
Options -> Game Options Tab-> Toggle Aging
No not as far as i know.
Press CTRL + SHIFT + C to access the cheat window, then enter the following: aging off
"Aging off" or (on)