What poem does "Young people know each other happily, but miss their old friends when they are dying" come from?

1, from: except the official went to Que to Jiangzhou to send the doctor Li (Li Chengye) (Tang Dynasty: Han Yu)

2. The original text is as follows:

Except for the official, he went to Que to Jiangzhou to send Dr. Li from Hubei (Li Chengye).

Tang dynasty: Han Yu

From Pengcheng to Ezhu, the wind blows for one day. Don't waste an old friend's book and sail for no reason. ?

An old friend pays tribute to Zhenjiang. If I escape, the dragon bell will return to the starting point. ?

Don't come. I am three years old. I hope I can make it all the way through. Not knowing each other is close at hand, but it can be counted as a lifetime. ?

The tooth fell out, and the temple turned white. Every year is over half a year, and there is not much pain in the future. ?

Teenagers learn new things, but when they are old, they miss old friends. Such as flesh and blood, prefer to avoid each other. ?

I used to be stupid, so I can't leave my words behind. Children also have words, I still know. ?

I have finished my work, and I want to change it. Sang Yu, if you can accept it, I would like to send the word acacia.

3, translation: It's not a day or two since I arrived in Pencheng, thinking that I should be knowledgeable and ask questions all my life. My friends have been photogenic about resigning and returning to China, and I have been demoted and expelled, and I have returned to my old age of idleness. I was in my thirties at that time. Seeing the long road, everyone ignored each other when they met. What should I do in my old age? My teeth are almost gone, my hair is already white, and I am over half a year old. I'm afraid the future will be more bitter than happy. When I was a teenager, I coveted new music, but I missed my old friends in my twilight years. It doesn't matter even if it's flesh and blood. I'm really stupid and can't change it. There is something wrong with what I said, but I still understand. Please give me a chance to change, and now write down my wish.