I've had to be a little flexible with my age groups in one of my books because of the complicated story history. My main character is 14 years old and his flashbacks throughout the story are important to understanding the chronology of the book and its sequals. His earliest flashbacks are from when he's around 3. He's 7 when he and his friend loose their parents (his parents, his friend's adoptive parents, since his family adopted said friend). Is it unrealistic for someone to remember things like dialogue and TV programs from when they're between 3 and 5? And how unlikely is it for a pair of 7 year olds to be able to survive on the streets during a war? Also, I have some side characters in the same book who are 7 and 8. One of them is sort of a child genius--an unrecognized genius, but a genius none the less. The other isn't stupid, he's just a coward. They both sound older than they are, though. So far I'm working on the assumption that the 7 year old lives in his genius brother's shadow, and mimics him more than anything else when around him. How can I make them sound younger? I've never been good at it. Childlike slang? Bad grammar?