Don’t wait and see, the young man’s head is gray, and he is empty of sorrow

It means: Don’t waste your years, and the young man’s black hair is gray, and you can only regret and be sad alone.

From Yue Fei's "Man Jiang Hong·Writing Hues", the full poem is as follows:

I am so angry that I lean on the railing and the misty rain stops. He raised his eyes, looked up to the sky and roared, with strong feelings. Thirty years of fame and dust, eight thousand miles of clouds and moon. Don't wait to see the young man's head grow white, and it will be empty and sad.

Jingkang’s shame is still not over. When will the hatred of the ministers be destroyed? Driving a long car, crossing the gap in Helan Mountain. The ambition is to eat the meat of Huns when they are hungry, and to drink the blood of Huns when they are thirsty. Waiting to start over, clean up the old mountains and rivers, and face the sky.

Full word translation:

I was so angry that my hair stood up, so I raised my hat and climbed up to lean on the railing. A drizzle had just stopped. Looking up at the vast expanse, looking up to the sky and sighing, my heart is filled with the heart of serving the country. Although I have established some achievements over the past thirty years, they are as insignificant as dust. I have traveled 8,000 miles from north to south and gone through many turbulent lives. Don't waste your years, your youth's black hair will turn gray, and you will only have regrets and sorrows alone.

The shame of Jingkang Nian has not yet been washed away. When will the resentment of the ministers be extinguished? I will drive a chariot to attack Helan Mountain, and even Helan Mountain will be leveled. I am full of lofty ambitions. When I am hungry during the war, I will eat the enemy's flesh. When I am talking and laughing, I will drink the enemy's blood. I want to start all over again, regain the old rivers and mountains, and pay homage to my old capital, Jingque.

Yue Fei (March 24, 1103 - January 27, 1142), male, named Pengju, was born in Tangyin, Xiangzhou (now Tangyin County, Henan Province). During the Southern Song Dynasty, he was a famous general, military strategist, strategist, national hero, calligrapher, and poet who fought against the Jin Dynasty.