White-haired grandfathers and grandmothers stood on the stage, blushing and singing "Teenager", but the word "teenager" has nothing to do with age, representing pure initial heart and incomparable love. This group of elderly singers, whose average age is over 75 years old, stood on the stage and sang "Teenagers" in their hearts with deep and vigorous voices, and invited their grandparents, all of whom graduated from Tsinghua. They all live in Shanghai now, and after retirement, they formed such an art troupe of Tsinghua University Alumni Association. After graduation, they bravely went to all parts of the country and made many contributions in infrastructure, aerospace, chemical industry and other fields. After returning from studying abroad, some of them are still spreading their knowledge and enthusiasm on the land of the motherland. They represent a pure spirit, and a pure heart is about such a thing.

Old people don't shy away from their age and white hair. They also laughed and said that music made them younger, and ideals made them become attached and reunited. Perhaps the song "Teenager" reminds people more of youth and beauty. But when the old people stood on the stage and performed this song together. People can't help but burst into tears, because they were excellent students who were admitted to Tsinghua decades ago, and they were teenagers with well-proportioned bodies. At that time, they were simple and naive. If you have achieved something, everyone wants to return to China, or dedicate their passion to the motherland, with no regrets. Maybe young people in this era will have other better choices. This is not right or wrong, but what they want. The hearts of the old people have never changed or wavered.

The youngest in this team is 6 1 year, and the oldest is over 90 years old. The 90-year-old man likes playing the violin as much as he did when he was young. He used to be a senior engineer in the field of flight, and now he is still in high spirits. Most old people are white-haired, and those with black hair laugh that the color of their hair is fake, but their words and expressions are still clear, and their logical thinking is no less than that of young people. Joining the art troupe is the secret of their youth. Old people get serious and really don't lose to young traffic stars. When they sing, they are moved by enthusiasm and rich experience. The thickness of life has become a bright gem, and it will not be dim or even dull after retirement.

Young couples who have been together since childhood still hold their children's hands when they are white-haired. At work, I used to go my separate ways, but when I finished my studies, I came back hand in hand. After retirement, one loves to play the violin and the other loves to play the piano, but they are also immortal couples.