It had been established that the heads of institutions should form teams of workers of different generations with different expectations and methods of work in the context of reforming the public service. The periods of forming generations have been set on the basis of literary sources, such as: Generation X (the period up to 1980); Generation Y (from 1981 to 1996); and Generation Z (after 1997). The most important criteria which form the characteristics of public servants have been singled out, and common and distinctive traits of Generations X, Y, and Z have been systematized. The distribution of the number of public servants in Ukraine has been analyzed by gender, age and the category of position. Based on the use of correlation-regression analysis, the tendency of changes in the share of state servants of Ukraine by age category up to 2020 was investigated. This made it possible to confirm the suggested hypothesis of the dependence of the effective reform of the Ukrainian public service on the effective interaction and cooperation of all generations of public servants. The main requirements for a public institution in which the employees of the new generation will work have been systematized.