What is the size of a free throw and three point line is for a junior?

Question

I have a small place where I can play basketball in my back yard. I am needing to know what is the standard year 8, free throw and three point line?

Also what should I use to mark it out with?

Answer 1

all the markings are the same no matter of age.Besides don't put restrictions on the player let them find their own range they will thank you in years to come

Answer 2

For an eight year old it'd be 15-20 ft. For an 8th grader it's be 30 ft.