Children love performing their little dramas, sketches and puppet shows for the family. They enjoy the chance to show off to the most important people in their lives and the most important people in their lives love watching.
When does that change? Maybe when the cute factor stops overriding bad theatre. Maybe when only some of the cast have their heart in it. Maybe when the performers stop being performers and begin to be audience.
In my own case, it was when I realised I wanted to create the words for others to use. I wanted to see what movement they inspired in the actors, what subtext they suggested to the director and what questions they aroused in the audience member.
When anyone asks why do you write plays, (as opposed to novels, short stories etc) I used to find it difficult to answer. I still do because creating a play has so many more imponderables than a piece that will become hard copy. In the end, I think it has to be drama because I think mainly in conversations. Over and over they turn as I edit and trim till the right words are spoken by the right person.