according to erik erikson in late adulthood the individual reaches the eighth and final stge of the life span in which one reviews and evalates ones life and the choices one has made. erikson labeled this stage

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.