When the goal kick is in place do all of the defending team have to be at least 5 yards from the placement of the ball Which is the kicking team for U8U9 and U10 age group?

Answer 1

According to the FIFA Laws of the Game, all opposing players must be 10 yards away from the ball on any placed kick. The distance is often shortened for younger age groups. See your local league modifications to the Laws of the Game for a specific answer.

In the case of a goal kick, they should be outside of the penalty area.