Why do people drift away when they grow up?

When they grow up, they all drift away because of life. After all, everyone's growth trajectory is different, so we are doomed not to spend it together at some nodes of growth. When they grow up and have their own families, they will be even more alienated.

When I was a child, I could play together, on the one hand, because I lived close, on the other hand, I was basically in the same school. But in high school, some people may go to a good high school, some people may go to a bad high school, and some people may go to a vocational high school because their learning levels are different. Since high school, everyone's development path is different, and their outlook on life has become different from before. When you are young, you will become more and more alienated.