It's quite possible, the time frame depends upon the state SOL pertaining to child support. The custodial parent can file in the state where the order was granted or in the state where the non-custodial parent resides. The petitioner should choose the state with the longest Statute of Limitation's when filing the claim.
until the child is 18
18
Yes, is that child under 18? Then, you owe child support.
Back child support is paid until paid in full, regardless of the age of the child.
Yes.
No. Child support arrears are owed to the parent.
No and you pay the support to the parent not the kid. If the child is 18 there is no longer a need for child support. If someone has been paying for you and believed they were the father they can sue you for the money though.
no
Retroactive up to 18 years. see link
yes you can get sued for back child support. If the child is yours, you need to take responsibility until the child is 18.
NOT if you owe back support. It doesn't matter how old the child is or whether or not she has children IF you owe back support you MUST pay it
Up to 18 years retroactive, depending on the state. The mother can file until te child is 18, or the child can file from 18-23 depending on the state. see link