Yes, with the growth of age, even in their twenties, they feel old for a moment, which is not only caused by physical aging, but also by the decline of psychological acceptance.

For example, at the age of 30, you are not like yourself at the age of 20. Your contact ability with new things is lower than before. The most direct impact of this decrease in enthusiasm is that you hate this acceptance of new things and want to live in old things. Although the old things are old, they can make you feel happy, save energy and be new.

For example, now, when I was in my twenties, I only caught a cold on online games that I liked in my sixties and sixties. I prefer to play the earliest 2D games, so even though the quality of the games is rough and the content is simple and rude, even so, you don't like the 3D experience of the games now. What you remember is an old game you chose. And now let you accept a new game, you must have a contradictory mentality, instead of seeing all the games so fun and easy to use in your youth.

Another example is your aging body. When you used to play this sport, you would think it was too easy for you. In the past, you could go out in the hot summer sun and play basketball at 2 o'clock until the sun went down and everyone left. Now, you feel that you still have all the energy to play basketball. At this moment, you feel old.