for the rotating light wave, as seen during its traject, it's travel, arrival is indeed instantaneous. it arrives at the same time it departed, it did not age.
light is forever young. For A. Einstein thinking of surfing the wave of light, the clock on the church tower never turned or advanced. Eerily like James 1 has it: "there is no variation or turning of the shadow "( the sundial) for the eternal deity. but:
that is not true of the observer. Earth orbit has 1000 light seconds diameter btw.