"Adult children" comes from "adult children of alcoholics", but now has broader reference to adults who were abused emotionally, physically or sexually in childhood.
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 ...
Psychology Today: 5 Ways to Free Your Adult Child From Negative Self-Talk
Based on counseling many adult children over the years, their self-talk either crafts the blueprint for their success or creates barriers that impede their progress in life. Self-defeating thoughts, ...
WHO/Europe supports countries to improve the mental health and well-being of children, adolescents and young people. Childhood, adolescence and young adulthood are critical stages of life for mental health and well-being, when people develop skills in self-control, social interaction and learning. Negative experiences – at home due to family conflict or at school due to bullying, for example ...
Childhood and adolescence are critical stages of life for mental health. This is a time when rapid growth and development take place in the brain. Children and adolescents acquire cognitive and social-emotional skills that shape their future mental health and are important for assuming adult roles in society. The quality of the environment where children and adolescents grow up shapes their ...