"Einstein proclaimed that all objects in the universe are always traveling through spacetime at one fixed speed--that of light."
"Thus light does not get old; a photon that emerged from the big bang is the same age today as it was then. There is no passage of time at light speed."
"Of course, the after-the-fact agreement was only marginally convincing. When you know the answer you want, it is often all too easy to figure out a way of getting it."