Coding is used everywhere. From this computer, to this website. To the app Mr. Jump
Also, its for all ages.

From eight,

 To eighty (or more).

Don't worry. When you were young you coudn't
do math.

It will be like that. You will start coding javascript like a new concept. Do basic stuff. Get it in your head. Do harder stuff. Put that in your head and so on.
I hope you will become able to use sunSize++ and all the other parts of coding.
I believe in you.
The End