You need to check your state guidelines. Only a few states do that. For the most part your child support has already been increasing with automatic increases.
The child can file prior to age 19.
Yes, but you have to file for it in court.
The parent. It was the parent who incurred the expenses to support the child.
See link below. Child Support Laws - At What Age Does Child Support Stop?
Only if you adopted the child.
child support stops at age 21 in NY
do u have to pay child support when the child is still in school at the age of 18
See Link BelowChild Support Age-At what age does child support stop and what steps need to be taken to bring this about?
A person who is a citizen of the United States will be required to pay child support at age 18. Child support must also be paid until the child reaches the age of 18.
Child support must be paid until the child reaches 18 years of age in Maryland. If the child has not graduated high school and over the age of 18, child support must continue.
If you are in the US, the fact that you are now married/pregnant has no effect on child support for another child.
In Arizona, you can file to have it raised if the either parent has a increase or decrease of income of 15% or more. And/Or if the child is over 12, then it can be raised 10%.