A photon traveling at the speed of light is also traveling at the same speed at which time "happens." Because it's going the same speed as time, the photon doesn't experience time passing at all.
When you go faster and faster, the difference between time's speed and your speed decreases (from your perspective). Should you ever get to light speed, it would seem to you as if time had stopped.
the_criminal_lawyer t1_j6pfu1p wrote
Reply to ELI5 why time slows down as you go faster by -cool--beans-
Because you're catching up to the speed of time.
A photon traveling at the speed of light is also traveling at the same speed at which time "happens." Because it's going the same speed as time, the photon doesn't experience time passing at all.
When you go faster and faster, the difference between time's speed and your speed decreases (from your perspective). Should you ever get to light speed, it would seem to you as if time had stopped.