What does 老衰 mean?
老衰 is a Japanese noun meaning “senility, senile decay” in English. It is written as 老衰 in kanji, ろうすい in hiragana, and rousui in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
彼は老衰で二年前に亡くなった。
He died of old age two years ago.