How to explain "young and frivolous, late and cherish glory." This sentence?

"Young and young, proud of being late and precious." It means:

People look down on time when they are young, and only cherish it in their twilight years. That is to say, the young don't work hard, and the old are sad.

1. From "For Your Old Age"

Nanchaoliang He Xun

Weak exercises can't be planted, and Ji Bo can't fight.

The shallow wisdom is over, and the name is Anxi.

The interference caused by service fatigue is negligible.

Young and frivolous, a little late and precious glory.

Today is completely discredited and untrue, and everything was wrong yesterday.

Although the new knowledge has been happy, the old love has been violated.

Looking at the countryside and the leaders, my eyes are full of tears.

The passengers are haggard and spring is complacent.

The shore flowers are in the water, and Jiang Yan flies around.

Sailing for no reason, returning to the sunset alone.

2. Poet of the Southern Dynasties in the Liang Dynasty, the word Zhongyan, was born in Donghai Yong (now Lanling County, Shandong Province), the great-grandson of He, the foreign minister of the Song Dynasty, and the son of Qi Taiwei who joined the army. At the age of eight, he can be a poet, a scholar in a weak state, and a minister in the Ministry of Water Affairs. Poetry is as famous as Silver Pit, and Yin He ranks first in the world. Wen is as famous as Liu Xiaozhuo, who is called He Liu in the world. His poems are good at writing scenery and refining words. The eight volumes recommended by Du Fu have been lost today. What is the collection of the Ministry of Water Affairs in the Ming Dynasty? Later generations called it "He Ji Shi" or "He Shui Bu".