Yes, on a frame of reference that's moving at the speed of light, time does not advance.
But time advances on any frame of reference that doesn't move at the speed of light.
And, since this speed is finite, we can measure an age, or the time that photons take to go from point A to point B.
But time advances on any frame of reference that doesn't move at the speed of light.
And, since this speed is finite, we can measure an age, or the time that photons take to go from point A to point B.