Can I ask for retroactive child support for 10 years?

The main question will be what occurred after the first time you filed child support.  If you received a child support order 10 years ago, then that order is still in effect and the father therefore owes arrears going back to the date of the filing of your first petition.  But again, this is if you actually were given an order by the court.  If your case was dismissed, and therefore there was no standing child support order, then you will have a hard time getting a judge to order retroactive child support back to the day of the first petition.   The more likely case, if there is no standing child support order by the court, is that you will only be given retroactive child support going back to the date that you recently refiled for support after the father was located.