In another post there is an example of a vessel moving close enough to the speed of light that the journey to the galaxy Andromeda 2.5M light years takes only 4 hrs on the vessel's clock. In its own frame of reference the vessel is moving just above 600K LY/hr. Yet a photon that left at the same instant would arrive before the vessel and always be measured as traveling at velocity c with respect to the vessel. As the velocity of the vessel S/T approaches the speed of light T (actually delta t) approaches 0, ie the 2.5 M LY trip takes, 3 hrs, 1 hr, 1 minute, 1 second, etc as v approaches c. At c, T (delta t) = 0, for all distances S, implying that time does not exist for a photon. In the photon's frame of reference its arrival and departure and the trip in between are simultaneous, its velocity is effectively infinite and since no time passes it doesn't age no matter how "old" it is--how long ago it was emitted.