The way this plays out on the ground in domestic adoptions within the US, with relatively few exceptions, is you either get a newborn infant, or one that is under a month or 3, because the birth mother either formed an adoption plan while pregnant or changed her mind about further parenting(since after 9 months you can't claim she's opted out of parenting, she's already invested a lot into that life whatever comes after). Outside of of the infant stage, what children are available in the system? Even if I were so inclined I can't drop my imminently-to-be 2 year-old off at the fire station anymore. That's abandonment at this age. Even if I could, I and most parents wouldn't dream of actually doing it. So children past infancy are almost always wards of the state by force. They're seized through suspension or termination of parental rights. Maybe they'll eventually be placed back with their biological parents, maybe they never will be, maybe they'll bounce back and forth over the course of several years(which is really fun for foster parents). But they are still likely to be older at that point.