This hack is for Open For Business, and should only be used if Open For Business is the latest expansion you have installed.
Versions for the other expansions are available from the download post.
The 6 variants of this hack should only be used one at a time:

NoAgingForAdults_OFB.package Prevents Aging in adults.
NoAgingForAdults&Elders_OFB.package Prevents Aging in both adults and elders.
NoAgingForElders_OFB.package Prevents Aging in elders

The 3 versions in the "InteenCompatible" Folder of this zip should only be used if you use the InTeenimater, and should be places in the same folder as the inteen files.