DS started doing a lot of writing at 4 -- he would write stories (heavily plagiarized) about his favorite characters, notes to all his friends (who couldn't read yet), and even made a couple of "newspapers" with little stories and a weather report. I'm still mad at DH, 7 years later, for throwing that one away.
DD7 has been writing for a couple years now, but I'd have to look back in her "box" to see when it started. She writes (also heavily plagiarized) stories about the characters in books she's reading.
DS grew to hate writing (and reading) and almost can't be tortured into it now, but I think that's just him -- I don't get the feeling that DD will grow out of it.
