yes
Probably, but there should be a credit for past-due support owed to you.
It depends on which state you are in but most states will not place a lien on any property for back child support. Some states will report back child support to the payer's credit report though.
It affects your credit in the same manner as any debt brought into the marriage. see related links
It depends on the amount and it's affect on your credit rating. Why are you behind? see links
I doubt there were many child support laws back then. Normally, only the custodial parent of the child can file for child support, not the actual child.
yes
Yes, they can. n
Yes.
your State's child support agency
Yes, if a parent owes back child support, they will have to pay it until it is zeroed out even when the children are grown. The age of the child does not affect back child support at all.
No, you are not responsible for their back child support.
what if your done with current child support but still owe interest for back support.