Correct

正当年

/ zhèngdāngnián /
Strokes

Definition

to be in the prime of life

Example

As a Noun

heyday; prime of life

1
Méi
rén
zhīdào
知道
wèishénme
为什么
zài
zhèngdāngnián
正当年
de
shíhou
时候
猝死
  

Nobody knows why he died suddenly in the prime of his life.