If you like to play with toys as an adult - what's wrong with that?
Many adults have animal playthings - instead of imaginary ones, people have living pets. On top of that, in the Pagan world there is the concept of unseen familiars or spirits that people can connect with. a dragon is a common form of that type of spirit. Yet most of the people who enjoy those types of relationships are grown-up and working, raising families, etc.
I feel sorry for all people who have completely lost their childish wonder.