Yes, in all 50 states. In 30 states, the statute of limitations is 24 months. In 20, cannot be done at all. see link.
No. They are required to continue to offer coverage, but they are not required to continue paying for it. You would be responsible for the full premiums.
No, there is no way to legally "opt out" of child support. If a court order has been established for child support, the obliger is required to continue paying, regardless of whether or not the recipient wants to continue receiving payments.
Yes, see link
on her birthday
yup
Yes.Yes.Yes.Yes.
no
Yes, you have to pay until she is emancipated.
Paying child support isn't really a matter of choice. Each parent is required to comply with the court order(s) in the case.
Retirement does not excuse one from paying support; however, the retiree could petition the court to lower the payment based on substantial decrease in income.
Often, if you begin paying, you have to continue paying, even if you're not the father. See related link
If you are paying the mother because of a court order then you must continue to do so if the girls have not reached their majority.