Components
老衰 is an exact match with one form of the following word:
老衰
BOOST
Reading : ろうすい   
senility; senile decay; infirmity (through age)
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My current mastery of 老衰:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 69,634 which gives a rank of 12,105
老衰 is the most useful form. 1 additional form is shown below.
• This form is used about 60% of the time
• Google Japan frequency rank: 119,000 (about 1,090,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 10 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
しいん
死因
ろうすい
老衰
とは
なに
にほん
日本
ろうすい
老衰
たいこく
大国
ろうすい
老衰
では
ねない
アメリカ title of book, album etc.
What Is It Like to Die of Old Age? In Japan Many People Die of It, (But) in America People Cannot
すで
ろうすい
老衰
ちょう
れきぜん
歴然
たるものあり
めじり
眼尻
あたり
しわ
ひびいったような
ぐあい
具合
であった
He was already showing obvious signs of decay due to his old age, and the wrinkles around the corners of his eyes were starting to show tiny cracks.
Source: 鳳仙花川崎長太郎, translation by Bunsuke)
かれ
ろうすい
老衰
にねん
二年
まえ
くなった

He died of old age two years ago.
ろうすい
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 40% of the time
• Google Japan frequency rank: 137,000 (about 682,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 10 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
VIEW INFLECTIONS
ロウ   old   おいる    ふける to grow old   
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old
さじ spoon   
スイ   おとろえる to grow weak, decline   
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アイ   あわ piteous, sorrowful   あわれむ to feel pity   
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コウ   ク   くち mouth   
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イ   ころも clothes   
イチ   イツ   ひと    ひと- one   
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