This question based on the site located here: http://galileo.phys.virginia.edu/classes/252/srelwhat.html The question is: If the object (spaceship) moving close to the velocity of light and I'm as a static object. The time goes slower in the object moving with constant velocity (inertial frame) of light then he/she in the spaceship will age slower than me remained at the Earth. This is the situation when I look at the moving object. But if we take situation vice a versa. He/she in the moving object (spaceship) looking at my watch (me in Earth) then for her/him my watch is slowed down then I'm aging slower than her/him. "That is to say, each of them will see the other to have slower clocks, and be aging more slowly." But as I know the only the person in the "really' moving spaceship will age slower than the one stayed stationary (not moving) as explained in twin paradox. Please explain me this contradiction. Thank you.