I wrote my first story (non-schoolwork) when I was 8 or 9. I wrote 100+ pages of a "novel" (totally ridiculous and juvenile) when I was 11. I fell in love with poetry at 16, and I have been attempting to write my own ever since.
My parents have poetry I wrote when I was six years old. I even wrote "Poetry" at the top of it and dated it it was mostly about gardens and mermaids and clouds and stuff haha. But that's when I started.
Well, considering I'm only 17, and I had only begun to learn English when I was 5....I would say around the 6-10 age gap. I suppose I first got into writing when I first began reading, and I couldn't actually read until I learnt how to....and I started reading when I was 7, so yeah...
I've been told that I learned to read even before I fully learned to talk. And I remember already starting to collect my poems into a handmade 'book' when I was six or so. So I was obviously writing well before then.
Middle school, really, and I don't remember what turned the switch exactly, but suddenly my lifelong love of reading birthed a desire to write prose and off I jolly well went. At the risk of sounding like a dweeb, though, I've got to say that I've always been a storyteller, as long as I can remember. Always had the need to craft and shape and imagine, all that good stuff. Poetry's a different beast, I started that as a freshman in college, only a couple of years ago, so I'm very much a baby poet and still learning.
I started in third grade, so about eight maybe nine. I was bored in the library (at that point i started reading books meant for teenagers, i was an oddball .) i picked up a notebook i got from B&N and i started writing my first short stories. The cafeteria lady was the one who encouraged me to start writing more.
I started when I was 9. It was a teacher that showed and taught me how transition my stories from my mind to paper. My friends and I would write together but before that I was a story teller. I told all sorts of stories to my friends and to my family and I'd run around and adventure, pretending I was apart of these stories. It comes and goes though, like the tide.