At the Carlsbad 5k this year on March 29th, Daniel Skandera set the 5k road race world record for 7 year old boys on a certified course by 29 seconds. His time was 19:25 (6:15 pace).
His time is also 2 seconds better than the 8 year old world record.

List of the age group world records for 5K

Here is the story about his mile WR