What are gross motor skills for 8-12 year olds?

That is too big of an age difference to have the same motor skills, but a 6 year old should generally be coordinated enough to throw and catch, ride a 2 wheel bike, buckle up a seat belt, drink from a cup without dribbling as well as other general physical activities well. A sixteen year old should have more finesse at these activities, being able to use a variety of balls, for instance.

Usually, if the child is reaching age appropriate milestones at age 6, he will be fine at 16.