My guess is that GPT-4 will not be able to convincingly answer a question as if it were a five-year-old. As a test, if you ask an adult whether a question was answered by a real five-year-old or GPT-4 pretending to be a five-year-old, the adult will be able to tell the difference for most questions in which an adult would give a very different answer from a child. My reason for thinking GPT-4 will have this limitation is the limited amount of Internet written content labeled as being produced by young children.
My guess is that GPT-4 will not be able to convincingly answer a question as if it were a five-year-old. As a test, if you ask an adult whether a question was answered by a real five-year-old or GPT-4 pretending to be a five-year-old, the adult will be able to tell the difference for most questions in which an adult would give a very different answer from a child. My reason for thinking GPT-4 will have this limitation is the limited amount of Internet written content labeled as being produced by young children.
If GPT-4 training data includes YouTube video transcripts, it might be able to do this convincingly.