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I don't know if this has already been said but it all relates back to Relativity. Einstein predicted that everything is moving through the space-time continuum at the speed of light, so if your travelling through the time dimension at the speed of light, you won't be moving at space. However, since a photon is moving through space at the speed of light, it has 'used up' all of its space-time speed and therefore it is unaffected by time. In a sense, the photon isn't 'aging' at all.
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