30 years old, working normally in the school library. According to relevant public information, librarians are between 22 and 40 years old, and their working years are 1 year and 5 years. A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education.