[kijin]

I'm not sure about the "born with" part, but I think exposure to good storytelling in early childhood might play a significant role in whether you grow up to become a good storyteller. A consistent theme among famous writers is that they loved to read from a very young age, their parents used to tell them lots of bedtime stories, etc.

Maybe this early exposure to fiction influences a developing mind in a way that's much more difficult to achieve once you have grown up. Learning to jump seamlessly between Narnia, Hogwarts, the Hundred Acre Woods, Victorian England, Medieval Europe, the Arabian Nights, and back to the real world is a bit like learning a new language, a new culture. Children learn new languages much more easily than adults do, and the languages you learn in your childhood stick with your accents for the rest of your life.