What does the phrase ”inevitable hour” mean?

Reading Comprehension: Read the quoted parts carefully and answer the questions in English. Write your answers in the corresponding space on the answer sheet.”The boast of heraldry, the pomp of power,
And all that beauty, all that wealth e’er gave,
Awaits alike the inevitable hour.
The paths of glory lead but to the grave.”
What does the phrase ”inevitable hour” mean?
【正确答案】：

​THE PHRASE MEANS THE TIME OF DEATH.

【题目解析】：短语意思为：死亡时间。