This hack is for The base game, and should only be used if you dont have any expansions installed.
Versions for the other expansions are available from the download post.
The 3 variants of this hack should only be used one at a time:

NoAgingForAdults_NoEp.package Prevents Aging in adults.
NoAgingForAdults&Elders_NoEp.package Prevents Aging in both adults and elders.
NoAgingForElders_NoEp.package Prevents Aging in elders