Give an example what it means to turn back and be a hundred years old ?

This is simple, you missed the first half of this sentence, that is, "a misstep is cast into a thousand hatreds". It should be explained in a link. If you only explain your sentence, it means that a person is very assertive and insistent on himself, but when he grows old, he realizes that many of the things he thought were right in the past are actually wrong.

He regretted it, but he was no longer in a position to make amends. It expresses a kind of helplessness, a kind of remorse.

In life, I only know how to bury my head and move forward, and when I know how to look back and reflect on my life, I will be a hundred years old.

To put it simply, it's almost hanging, and there's no point in anything!

Looking back, it's been a hundred years" means that when I think that I should look back at the road I have walked and do introspection, I realize that I have already grown too old, and everything is too late.

Looking back, it's already a hundred years old" Source: Ming Yang Yi's "Ming Liang Ji": "Tang Xie Yuanyin is abandoned, and the poem is cloud:

One misstep becomes a thousand years of laughter, and then looking back is a hundred years old. Later Qing Dynasty poet Wei Zi'an's "Flower Moon Trace": One misstep becomes a thousand years of hatred, and then a hundred years later.

Looking back, it has been a hundred years of "warning the world not to do things that they will regret in the future, usually to think more about their past, and not to wake up after a hundred years."

The author Wei Xiuren (1818-1873), the character Zi'an, also known as Zidun, the master of the sleeping crane, the Taoist of the sleeping crane, also known as the aggressive Taoist, the unrepentant Taoist, was a native of Dongmenwai, Houguan County, Fujian Province (now Tatou, Dongmen Village, Hongshan Town, Gulou District, Fuzhou City), and a writer of the Qing Dynasty. According to the Annals of Mr. Wei Zi'an, he was born in the 23rd year of Jiaqing (1818) and died in the 12th year of Tongzhi (1873).

Looking back, it's already a hundred years of body" is a poem from the Song Dynasty poet Su Shi, the original closed sentence is "Look back, it's already a hundred sedan chairs, and go to the next level", which means that time flies quickly, and it becomes a hundred years in the blink of an eye, and it has to go to the next level, referring to the fact that time passes faster and faster.

Looking back, the last sentence that has been a hundred years old is a misstep into a thousand years of hatred. This sentence warns people to behave properly and prudently, and not to make a big mistake due to negligence or greed for fame and fortune.

Source: Ming Yang Yi's "Ming Liang Ji": "Tang Xie Yuanyin is abandoned, and the poem is cloudy: 'One misstep becomes a thousand years of hatred, and then looking back is a hundred years old.'" and Wei Zi'an's "Flower Moon Traces" in the Qing Dynasty: "One misstep becomes a thousand years of hatred, and it has been a hundred years since I turned back." ”

But it's a pity that I didn't say the lovesickness buried deep in my heart to you, so I can only helplessly time pass, and I think of the year again, but I can't help but for a long, long time, and I still haven't forgotten the friendship with you.

From Wei Zi'an's ** "Flower Moon Traces" in the Qing Dynasty.

Original text: Fangxin is afraid of carrying spring sorrows, and the flowers are lovesick and let you.

After washing away the dust of thousands of years, the gentleman's heart should be like a lotus root.

Acacia may not be able to meet, and the night rain and spring sorrow are red.

One misstep becomes a thousand years of hatred, and then look back on a hundred years.

"Flower Moon Traces" is made by Wei Xiuren in the Qing Dynasty**, Wei Xiuren, the word Zi'an, and the word Zidun. The book is 16 volumes and 52 chapters, originally signed as Xi Yingliang, the owner of the sleeping crane, and commented by Qixia Jushi. The earlier editions are the woodcut in the 14th year of Guangxu in the Qing Dynasty and the lead typesetting of the Shanghai Book Integration Bureau in the 18th year of Guangxu.