Youth is gone, and vicissitudes are gone; what's the meaning

Youth is gone, so are the vicissitudes: there is only one youth, and no one can come back, even if youth is a thing of the past.

Describe life as a time without turning back. When you are old, when you look back on the past, you will think of a small fragment. What you meet is your experience and experience. Express a satisfied attitude towards the present life.

The relevant sentences are as follows:

1, at this time, at that time, the sun was faint, the years were quiet and calm. ?

At that time, we were still young, the years were quiet, pure and happy, and it was beautiful to laugh and scold.

I don't want to be persistent for anyone, and I don't want to feel sorry for anyone. In this way, the years are quiet and there is no distraction.

4. Time is extremely soft, witnessing the past of all our experiences. The vicissitudes of life are still the same, and the joys and sorrows of those lives have all settled down. Time is deep and the years are quiet. ?

For a long time, I like the calm and melancholy that has been precipitated by years.

6, the sun is warm, the years are quiet, you don't come, I am not old. ?

7. The years are quiet and the world of mortals is carefree.