What is the general difference between peers?

The definition of peers is divided according to the year of birth, and individuals born in the same year are considered peers, so according to this definition, the age difference between peers is 0 years old. In real life, due to the differences of individual growth environment, lifestyle, health status and other factors, peers will show different degrees of maturity in physiology and psychology. For example, some peers develop early, while others develop late. Psychologically, some people are more mature because they have experienced more life challenges or received more education, while others are more immature because they live in a more protected environment.