Colonists now ask for age reversal treatment after they have been older than 25/80 of their life expectancy.
(While playing Hardcore-SK, there are races whose life expectancy goes way beyond 80 (e.g. 1000) while still asks for a treatment really annoyed me)
Used HarmonyLib. Load this after it.
Should behave the same so long as there's no other races whose life expectancy is not 80 years old in your colony.
[url=https%3A%2F%2Fgithub.com%2Fmasakitenchi%2FRimWorld_IdeologyPatch]SouceCode[/url][github.com]