25 year old female is searching for her biological father. Can she force the man to take a paternity test and if ot os deemed he is her father will he have to pay child support?

I am not in Tex by in WA after the child is 18 a dna test nor backchild support can be obtained unless the father was know didn't pay and now claiming to not be the father. If your looking and find him nothing can be forced on him now. In WA