There is a joke that the sign of success from 0 to 70 years old is symmetrical, and there is a certain age in the middle.

3 years old, do not pee pants; 5 years old, can eat by himself; 18 years old, able to drive by himself; 20 years old, having sex; 30 years old, rich; 40 years old, rich; 50 years old, rich; 60 years old, having sex; 70 years old, can drive by himself; 80 years old; Be able to eat by yourself; 90 years old, don't pee pants; 100 years old, not yet hung on the wall; 300 years old and still hanging on the wall.