What is the default Elderly Health game rule in CK3?

Default: Elderly characters will get Traits like Clouded Eyes, Faltering Heart, Withering Mind, Fragile Bones, or Infirm. (patch 1.20.1.2)

Does changing the Elderly Health rule disable achievements?

Yes for “None”: the file gives it the flag blocks_achievements. The other settings keep achievements on.

Game rule · Difficulty · Health

Elderly Health

Default
Infirm Only
None ✕

Elderly Health is a game rule in Crusader Kings III (Difficulty and Health) with 3 settings: Default (the default), Infirm Only and None. “None” disables achievements. Patch 1.20.1.2, from game/common/game_rules/00_game_rules.txt.

This section as JSON: /raw/game-rules.json

Quick answers (2)

What is the default Elderly Health game rule in CK3?: Default: Elderly characters will get Traits like Clouded Eyes, Faltering Heart, Withering Mind, Fragile Bones, or Infirm. (patch 1.20.1.2)
Does changing the Elderly Health rule disable achievements?: Yes for “None”: the file gives it the flag blocks_achievements. The other settings keep achievements on.

3 settings

Default
Default
Elderly characters will get Traits like Clouded Eyes, Faltering Heart, Withering Mind, Fragile Bones, or Infirm.
default_elderly_health
Infirm Only
Elderly characters can only get the Infirm Trait.
The script checks it 5 times, in 5 places
Events 5
Every has_game_rule = infirm_only_elderly_health in game/common and game/events, by the top-level object it sits in.
infirm_only_elderly_health
None
Disables achievements
Aging comes without risk.
The script checks it 5 times, in 5 places
Events 5
Every has_game_rule = off_elderly_health in game/common and game/events, by the top-level object it sits in.
off_elderly_health

Source: game/common/game_rules/00_game_rules.txt line 282 (key elderly_health), modifiers from game/common/modifiers, names from the English localisation; Crusader Kings III 1.20.1.2.