Carlos Gomez is getting some decent bang for his buck on the recent purchase of one adult-XL Teenage Mutant Ninja Turtles costume. Fox Sports Wisconsin’s Andrew Gruman reports that the Milwaukee ...
Bleacher Report: Carlos Gomez Videobombs Mark Reynolds in 'Teenage Mutant Ninja Turtles' Costume
Cowabunga! You can be Donatello... Looks like there will be a lot of Teenage Mutant Ninja Turtles on the streets this Halloween. Yahoo recently released the top-searched Halloween costumes this year, ...
Comicbook.com: We Cannot Unsee This Horrifying Fact About the ‘Teenage Mutant Ninja Turtles’ Movie Costumes
We Cannot Unsee This Horrifying Fact About the ‘Teenage Mutant Ninja Turtles’ Movie Costumes
"Adult children" comes from "adult children of alcoholics", but now has broader reference to adults who were abused emotionally, physically or sexually in childhood.
Merriam-Webster has an entry for half-orphan, meaning someone with only one living parent. They say specifically a child, which would match the usual usage of "orphan" (as mentioned in the question), but it might be used of an adult sometimes, either jocularly or by extension. This doesn't distinguish which parent is dead, but could be combined with a further explanation if it matters.
The best way to do it, I think, would be to forgo the hyphens completely and go with: I am a psychologist who works with children and adults. Anything else is awkward, ambiguous, or both. If it's necessary to emphasize that this individual works with children and adults (i.e., this isn't just introductory information), you could add in a 'both': I am a psychologist who works with both children ...