"Hell, if I could explain it to the average person, it wouldn't have been worth the Nobel prize." - Richard Feynman
He did go on to write a very readable little book (from a lecture series) on the subject which has photons wearing little watches and waiting for the hands to line up. I'd say a keen eight-year-old could get something from that.
https://ia600101.us.archive.org/17/items/richard-feynman-pdf...