Illustration: In a quiet Japanese home, a very old adult with thin limbs and a deeply lined face slowly rises from an armchair. Both hands press firmly on the armrests, and a family member supports one elbow while a walking frame waits directly ahead.

JLPT N1nounLevel estimated by Bebop

老ろう衰すい

rousui

decline from old age

It refers to age-related frailty, not specifically dementia. Note written by AI.

Example sentences

彼かれは老衰ろうすいで二年前にねんまえに亡なくなった。
He died of old age two years ago.
Tatoeba · CC BY 2.0 FR · Source
老衰ろうすいのため65歳さいで亡なくなった。
He died of old age at 65.
KFTT corpus (NICT), Wikipedia · CC BY-SA 3.0 · Source
死因しいんは老衰ろうすいとも食道癌しょくどうがんとも言いわれる。
He most likely died of either old age or esophageal cancer.
KFTT corpus (NICT), Wikipedia · CC BY-SA 3.0 · Source

Kanji in 老衰

老old man; old ageOnロウKunおいる・ふける
衰decline; waneOnスイKunおとろえる

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