age_ranked_health_vulnerability_threshold_trigger

age_ranked_health_vulnerability_threshold_trigger = {
	OR = {
		# If you're already having problems...
		has_trait = infirm
		# Otherwise, we check health crossed against age.
		## Characters that are this old are vulnerable regardless of health.
		age >= 80
		## Else, the higher your health is, the older you need to be to suffer age-related health problems.
		AND = {
			health <= good_health
			age >= 70
		}
		AND = {
			health <= medium_health
			age >= 60
		}
		AND = {
			health <= fine_health
			age >= 50
		}
		AND = {
			health <= poor_health
			age >= 40
		}
		AND = {
			health <= dying_health
			age >= 30
		}
	}
	NOT = { has_trait_with_flag = is_immortal }
}

As written in game/common/scripted_triggers/20_health_triggers.txt.