HSK 6 HSK V7-9
Correct

衰老

/ shuāilǎo / 
Strokes

Definition

to age/to deteriorate with age/old and weak

Example

As an Adjective

senile; effete; aged; old and feeble

1
Jī
几
nián
年
bùjiàn
不见
  
,
tā
他
xiǎnde
显得
shuāilǎo
衰老
duō
多
le
了
  
。

He has obviously aged and weakened since I last saw him a few years ago.

As a Noun

senescence; senility