Extragalactic Astronomy Russian Based on the quantum-vortex model of relativistic jet activity of quasars and radiogalaxies (Ukr. Phys. J.—1991.—36, N 12.—P. 1785— 1795; Kinematics and Physics of Celestial Bodies.—1997.—13, N 5.—P. 24— 35) the law of evolution and characteristic times of jet activity of such objects is considered. The theory predicts that characteristic times of evolution are in the range of 10⁷-10⁸ years. quasar,radiogalaxy,characteristic times of evolution